Roy Keane has become renowned for speaking his mind. Whether the focus of his words is his team-mate, manager or opponent, the Irishman refuses to pull any punches, regardless of the consequences.

Talking about Alf Inge Haaland tackle, Observer Sport Monthly Magazine

"Even in the dressing room afterwards, I had no remorse. My attitude was, f**k him. What goes around comes around. He got his just rewards. He f**ked me over and my attitude is an eye for an eye."

On his career

"Fail to prepare, prepare to fail."

"I can look back and think 'I'm just one of the luckiest people in the world'."

Talking about Alf Inge Haaland tackle, quoted in book Keane - the Autobiography

"I'd waited long enough. I f**king hit him hard. The ball was there (I think). Take that you ****. And don't ever stand over me sneering about fake injuries."

On sections of the Old Trafford crowd

"Sometimes you wonder, do they understand the game of football? They have a few drinks and probably the prawn sandwiches, and they don't realise what's going on out on the pitch."

"I don't think some of the people who come to Old Trafford can spell football, never mind understand it."

About Ireland soccer manager Mick McCarthy, Observer Sport Monthly Magazine

"That man can rot in hell for all I care."

On former team-mate Rio Fedinand

"Just because you are paid £120,000 a week and play well for 20 minutes against Tottenham, you think you are a superstar."

On infamous tunnel incident with Arsenal's Patrick Vieira

"Patrick Vieira is 6 foot 4, and he starts having a go at Gary Neville, so I said 'come on have a go at me,' that's it."