Derry are one step away from the All-Ireland Senior Football Championship final, with Connacht champions Galway standing in the way of Rory Gallagher’s side.
Here’s all you need to know ahead of throw-in.
The game throws in at 5:30pm on Saturday, July 9.
It will be played at Croke Park in Dublin.
The game will be broadcast live on RTE 2 as well as Sky Sports Arena.
You can, but there are only a limited number remaining in The Hill (€35) and the top tier of the Hogan Stand (€50). There are no ticket sales at the stadium, you must buy before you go via Ticketmaster.
The respective champions of their provinces, this is a meeting of two teams who haven’t tasted a defeat in a long time.
Derry stunned Tyrone, Monaghan and Donegal to win the Ulster Championship and then hammered Clare in the quarter-finals of the All-Ireland to make it to the last-four.
Meanwhile, Galway overcame Mayo and Leitrim to reach the Connacht final, where they eased past Roscommon by a three-point margin.
Their All-Ireland final will be remembered more than Derry’s, though, as their clash with Armagh featured a mass brawl at the full-time whistle and a penalty shoot-out after the two sides couldn’t be separated in extra-time.
Eventually Galway would triumph in the shoot-out to set up tomorrow’s tie with Derry.
That would be Derry, but only just. Rory Gallagher’s side are favoured because they have looked more convincing on their way to this stage, but then Galway have probably had the tougher draw.
No matter who wins this semi-final, the victors will be ending a long wait for an appearance in the national decider.
Derry haven’t been to the All-Ireland final since 1993, when they won their one and only Sam Maguire by defeating defending champions Donegal, and they have only reached the showpiece on one other occasion in 1958.
Galway have been to the final more recently, beating Meath in 2001 to lift the trophy, and have a much richer history in the competition having claimed the title nine times and reached a further 13 finals.
However, both counties have had to wait a long time for their day in the sun. Now, one of them will get the chance.