A Tottenham Hotspur fan was left with a broken cheekbone, eye socket and skull after an unprovoked attack by a set of fellow Spurs fans who may have mistaken him for a rival Chelsea supporter.
Michael Voller, 23, who formerly worked for Spurs as a training ground gardener, was punched in the face as he left Wembley Stadium following Saturday's FA Cup semi-final.
Although Mr Voller has been discharged from hospital, he still needs treatment and doctors are concerned that his eyesight may be permanently damaged.
The attack happened outside at around 7.