Gary Neville has opened up on the moment 'all hell broke loose' when Ruud van Nistelrooy entered the Manchester United dressing room wearing a Manchester City shirt.
The two clubs, bitter historic rivals, had just faced off in the Manchester derby on November 2002, which saw City win 3-1 after a mistake from right-back Neville.
And the pundit revealed how legendary former United manager Sir Alex Ferguson erupted with fury at striker Van Nistelrooy.
The Dutch star had accepted a request to swap shirts with a victorious opponent and walked in clad in City's colours.