From Roy Keane's temper to Wayne Rooney's wild tackles, former goalkeeper Roy Carroll says Manchester United's old-school training sessions demonstrated the winning mentality at the club.
Carroll spent four years at Old Trafford and went on to win a Premier League medal in 2002-03, and also lift the FA Cup.
The ex-Northern Ireland international played his part in a dominant reign under legendary former manager Sir Alex Ferguson, and no-nonsense captain Keane.
