Surprised this wasnt mentioned and if this was actually true? http://metro.co.uk/2017/06/12/forme...y-keane-once-knocked-him-unconscious-6703388/ Roy Keane is famous for his short temper and a former Manchester United team-mate has revealed precisely why he commands such a notorious reputation. Former Old Trafford favourite Gabriel Heinze has told how he was once knocked out by the Manchester United captain after daring to cross him. After a defeat the Argentinean told Keane to ‘f*** off’. It was a terrible mistake. ‘We lost a game and I went in the dressing room first and Roy Keane was second. I liked to go first after the game; I didn’t want to speak to anyone as we lost,’ said the former defender. ‘I didn’t understand English, just the bad words. I heard my name and “f*** off” by Roy Keane, the best player. ‘I knew that was bad so I stood up to him, this idol of Manchester, this great guy who everyone loved, and replied: “F*** off, you”. I don’t remember what happened next.’ During the interview with Argentinian television he was asked if that was because he was knocked out, to which he replied: ‘Yes. Yes.’ Heinze spent three years at Manchester United during which he won the Premier League title. However he grew frustrated at a lack of playing time and after flirting with a move to Liverpool eventually left for Real Madrid.