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GLASGOW, SCOTLAND - APRIL 17:  A general view during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: A general view during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers is tackled by  Dedryck Boyata of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers is tackled by Dedryck Boyata of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers fans wave flags during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers fans wave flags during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers scores the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers scores the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers scores the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers scores the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' Kenny Miller scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers' Kenny Miller scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers' fans during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' fans during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Celtic fans sing ahead of the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Celtic fans sing ahead of the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17: Singer Rod Stewart looks on during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Singer Rod Stewart looks on during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers Chairman Dave King looks on during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers Chairman Dave King looks on during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Celtic fans let off a flare during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Celtic fans let off a flare during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  James Tavernier of Rangers puts pressure on Leigh Griffiths of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: James Tavernier of Rangers puts pressure on Leigh Griffiths of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  The Celtic team huddle ahead of the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: The Celtic team huddle ahead of the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers holds off the challenge of  Dedryck Boyata of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers holds off the challenge of Dedryck Boyata of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  James Tavernier of Rangers puts pressure on Leigh Griffiths of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: James Tavernier of Rangers puts pressure on Leigh Griffiths of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Barrie McKay of Rangers holds off pressure from  Stefan Johansen of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay of Rangers holds off pressure from Stefan Johansen of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' Kenny Miller scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers holds off pressure from  Dedryck Boyata of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers holds off pressure from Dedryck Boyata of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates after scoring the opening goal of the game during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' manager Mark Warburton (right) and Celtic manager Ronny Deila during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' manager Mark Warburton (right) and Celtic manager Ronny Deila during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Erik Sviatchenko (right) scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko (right) scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers' manager Mark Warburton during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' manager Mark Warburton during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Erik Sviatchenko celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's Erik Sviatchenko celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's Erik Sviatchenko celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's Erik Sviatchenko celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

PA

Celtic's Erik Sviatchenko scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

PA

GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers celebrates scoring the opening goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates scoring the opening goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers celebrates scoring the opening goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates scoring the opening goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:  James Tavernier of Rangers vies with Leigh Griffiths of Celtic during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: James Tavernier of Rangers vies with Leigh Griffiths of Celtic during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers manager Mark Warburton reacts during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Rangers manager Mark Warburton reacts during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:  James Tavernier of Rangers vies with Leigh Griffiths of Celtic during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: James Tavernier of Rangers vies with Leigh Griffiths of Celtic during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers celebrates scoring the opening goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates scoring the opening goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers celebrates scoring the opening goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers celebrates scoring the opening goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:   Scott Brown of Celtic receives medical attention during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Scott Brown of Celtic receives medical attention during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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Celtic's Scott Brown gets treatment on the sideline during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's Scott Brown gets treatment on the sideline during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:   Kenny Miller of Rangers is tackled by  Nir Bitton of Celtic  during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers is tackled by Nir Bitton of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Stefan Johansen of Celtic holds off pressure from  Andrew Halliday of Rangers during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Stefan Johansen of Celtic holds off pressure from Andrew Halliday of Rangers during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Stefan Johansen of Celtic holds off pressure from  Andrew Halliday of Rangers during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Stefan Johansen of Celtic holds off pressure from Andrew Halliday of Rangers during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Kenny Miller of Rangers is tackled by  Nir Bitton of Celtic  during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Kenny Miller of Rangers is tackled by Nir Bitton of Celtic during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Scott Brown of Celtic clears the ball during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Scott Brown of Celtic clears the ball during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Dean Sheils of Rangers goes down under pressure during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Dean Sheils of Rangers goes down under pressure during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Celtic's Erik Sviatchenko tackles Rangers' Dean Shiels (right) during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko tackles Rangers' Dean Shiels (right) during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's manager Ronny Deila during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's manager Ronny Deila during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Erik Sviatchenko tackles Rangers' Dean Shiels during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko tackles Rangers' Dean Shiels during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's Patrick Roberts reacts after a missed shot during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's Patrick Roberts reacts after a missed shot during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Patrick Roberts reacts after a missed shot during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's Patrick Roberts reacts after a missed shot during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Patrick Roberts of Celtic reacts after missing a chance during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Patrick Roberts of Celtic reacts after missing a chance during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Patrick Roberts of Celtic reacts after missing a chance during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Patrick Roberts of Celtic reacts after missing a chance during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:   Patrick Roberts of Celtic reacts after missing a chance during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Patrick Roberts of Celtic reacts after missing a chance during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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Rangers' Dean Shiels and Celtic's Kieran Tierney battle for the ball during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Dean Shiels and Celtic's Kieran Tierney battle for the ball during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' 	Kenny Miller and Celtic's Scott Brown (left) battle for the ball during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller and Celtic's Scott Brown (left) battle for the ball during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:   Nir Bitton of Celtic holds off pressure from  Kenny Miller of Rangers during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Nir Bitton of Celtic holds off pressure from Kenny Miller of Rangers during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers' Kenny Miller celebrates scoring his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Celtic fans let off a flare during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Celtic fans let off a flare during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Celtic' Scott Brown during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic' Scott Brown during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's Dedryck Boyata (left) and Rangers' Jason Holt (right) battle for the ball during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Dedryck Boyata (left) and Rangers' Jason Holt (right) battle for the ball during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers fans wave flags ahead of the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

Rangers fans wave flags ahead of the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers manager Mark Warburton celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Rangers manager Mark Warburton celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers manager Mark Warburton celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers manager Mark Warburton celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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Rangers' Wes Foderingham (right) and Martyn Waghorn celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Wes Foderingham (right) and Martyn Waghorn celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' Nicky Law scores the winning penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers' Nicky Law scores the winning penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers' manger Mark Warburton celebrates victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' manger Mark Warburton celebrates victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' James Tavernier misses a penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' James Tavernier misses a penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Callum McGregor reacts to a missed penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's Callum McGregor reacts to a missed penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' manager Mark Warburton during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' manager Mark Warburton during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Tom Rogic (hidden) scores his sides second goal  during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Tom Rogic (hidden) scores his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's Tom Rogic (not pictured) scores his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's Tom Rogic (not pictured) scores his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic manager Ronny Deila during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic manager Ronny Deila during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' Barrie McKay scores his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Barrie McKay scores his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic manager Ronny Deila during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic manager Ronny Deila during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Barrie McKay of Rangers celebrates team-mate James Tavernier after scoring their second goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay of Rangers celebrates team-mate James Tavernier after scoring their second goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Barrie McKay (R) of Rangers celebrates with his team-mates after scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay (R) of Rangers celebrates with his team-mates after scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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Rangers' Wes Foderingham makes a save at the feet of Celtic's Leigh Griffiths (right) during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Wes Foderingham makes a save at the feet of Celtic's Leigh Griffiths (right) during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay (R) of Rangers celebrates with his team-mates after he scoring their second goal during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17: Barrie McKay (L) of Rangers celebrates with team-mate James Tavernier after scoring their second goalduring the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Barrie McKay (L) of Rangers celebrates with team-mate James Tavernier after scoring their second goalduring the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' Barrie McKay celebrates scoring his sides second goal with team mates during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Barrie McKay celebrates scoring his sides second goal with team mates during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' Barrie McKay (not pictured) scores his sides second goal past Celtic goalkeeper Craig Gordon during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers' Barrie McKay (not pictured) scores his sides second goal past Celtic goalkeeper Craig Gordon during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers' Barrie McKay (second right)scores his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Barrie McKay (second right)scores his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' Barrie McKay (right) celebrates scoring his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Barrie McKay (right) celebrates scoring his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Erik Sviatchenko scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Erik Sviatchenko scores his sides opening goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers' Barrie McKay (right) celebrates scoring his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Barrie McKay (right) celebrates scoring his sides second goal during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Leigh Griffiths heads the ball during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's Leigh Griffiths heads the ball during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' Lee Wallace holds his face during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' Lee Wallace holds his face during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Leigh Griffiths reacts during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Leigh Griffiths reacts during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's Scott Brown during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Scott Brown during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Erik Sviatchenko of Celtic scores during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Erik Sviatchenko of Celtic scores during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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Celtic and Rangers' fans during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic and Rangers' fans during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Erik Sviachenko of Celtic scores their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Erik Sviachenko of Celtic scores their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Erik Sviachenko of Celtic celebrates after scoring their first goal during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' players mob goalkeeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow.
Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' players mob goalkeeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebtate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebtate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebtate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebtate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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Rangers' goal keeper Wes Foderingham as he celebrates with team mates after their victory during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow.
Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' goal keeper Wes Foderingham as he celebrates with team mates after their victory during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers' goal keeper Wes Foderingham as he celebrates with team mates after their victory during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow.
Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' goal keeper Wes Foderingham as he celebrates with team mates after their victory during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Dominic Ball and Rob Kiernan of Rangers celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: Dominic Ball and Rob Kiernan of Rangers celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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GLASGOW, SCOTLAND - APRIL 17:  Martyn Waghorn of Rangers celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty IMages)

GLASGOW, SCOTLAND - APRIL 17: Martyn Waghorn of Rangers celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty IMages)

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Rangers' goalkeeper Wes Foderingham and manager Mark Warburton celebrate after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers' goalkeeper Wes Foderingham and manager Mark Warburton celebrate after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic's Tom Rogic misses his penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Celtic's Tom Rogic misses his penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Celtic's Tom Rogic misses his penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic's Tom Rogic misses his penalty during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers manager Mark Warburton celebrates victory at the end of the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers manager Mark Warburton celebrates victory at the end of the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Celtic players looks dejected during the penalty shoot out during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Celtic players looks dejected during the penalty shoot out during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers manager Mark Warburton celebrates victory at the end of the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers manager Mark Warburton celebrates victory at the end of the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebrate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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Rangers goal keeper Wes Foderingham celebrates victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers goal keeper Wes Foderingham celebrates victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' players mob goal keeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' players mob goal keeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers celebrate winning the penalty shoot out  during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers celebrate winning the penalty shoot out during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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Rangers' players mob goal keeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' players mob goal keeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers celebrate winning the penalty shoot out  during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

Rangers celebrate winning the penalty shoot out during the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Jeff Holmes/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17:  Rangers players celebtate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland.  (Photo by Jeff J Mitchell/Getty Images)

GLASGOW, SCOTLAND - APRIL 17: Rangers players celebtate after beating Celtic in a penalty shoot out during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Jeff J Mitchell/Getty Images)

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GLASGOW, SCOTLAND - APRIL 17:  James Tavernier of Rangers celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

GLASGOW, SCOTLAND - APRIL 17: James Tavernier of Rangers celebrates after winning the penalty shoot out during the Scottish Cup Semi Final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty)

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Rangers' players mob goal keeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' players mob goal keeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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Rangers' players mob goal keeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

Rangers' players mob goal keeper Wes Foderingham as they celebrate victory after the William Hill Scottish Cup semi-final match at Hampden Park, Glasgow. PRESS ASSOCIATION Photo. Picture date: Sunday April 17, 2016. See PA story SOCCER Rangers. Photo credit should read: Danny Lawson/PA Wire. EDITORIAL USE ONLY

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GLASGOW, SCOTLAND - APRIL 17: A general view during the William Hill Scottish Cup semi final between Rangers and Celtic at Hampden Park on April 17, 2016 in Glasgow, Scotland. (Photo by Ian MacNicol/Getty Images)

Devastated Celtic playmaker Patrick Roberts has vowed to bounce back from the worst moment of his career.

The on-loan Manchester City man somehow failed to find the net against Rangers, missing an open goal from just six yards out.

It was an incredible blunder from the £12million former Fulham youngster, and let Gers off the hook at a crucial point in the pulsating Old Firm clash, which the Ibrox men went on to win on penalties following a 2-2 draw.

Mark Warburton's team were leading 1-0 when the ball dropped for Roberts after a Leigh Griffiths effort had come back off the post, but he blasted into the side-netting when it seemed easier to score.

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The 19-year-old said: "I should be scoring that and I know I should be. In any other game I would be putting that away.

"It just came to me and I hit the side-netting. I was distraught.

"It happens in your career. You have bad moments and that is definitely my worst ever. It will probably be the worst I ever have.

"I wasn't nervous before the game. I knew what it was going to be like to play against Rangers and knew what I had to do. It just wasn't good enough from me.

"I will come back from this, though. Right now I'm very disappointed for myself and the team."

Ladbrokes Championship winners Rangers twice took the lead through goals from Kenny Miller and Barrie McKay only to be pegged back by the top-flight champions-elect as substitutes Erik Sviatchenko and Tom Rogic both netted.

But the Light Blues got the win their stylish play deserved when Rogic blazed his decisive spot-kick over the bar during the nerve-shredding shoot-out.

"It's the worst possible way to go out of a semi-final - on penalties at Hampden to your rivals," Roberts said. "We're just distraught.

"But we have no complaints. We know it wasn't good enough."

Hoops boss Ronny Deila now faces serious questions over his leadership.

Celtic are on course for their fifth straight title but have struggled to assert their authority over Aberdeen, while Deila's European record is dismal.

However, Roberts said the Norwegian's players deserve a share of the blame.

"The manager has been great for me," he said. "He's played me and trusted in me. I've got nothing to say on his future.

"Do the players have to take responsibility? Yeah definitely. We know it wasn't good enough.

"We need to pick our heads up and win the league."

Belfast Telegraph