Sometimes anger and frustration on the football pitch boils over to the dressing room. As tempers fly between players and coaches, occasionally fans are graced with some incredible backstage stories about the times rivalries could not be kept confined to the football pitch. Strangely, Manchester United feature a lot on this list, and as the Red Devils were recently involved in another dressing room brawl against Manchester City, here's a look at six of football's most infamous backstage...
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