MasterChef judge George Calombaris has pleaded guilty to assaulting a teenager after the A-League grand final in Sydney in May.

The Network Ten personality was charged in May with assaulting the 19-year-old man at the grand final between Melbourne Victory and the winners, Sydney FC, at Allianz Stadium.

Calombaris, 38, a keen Melbourne Victory supporter, was caught on camera losing his temper with the Sydney FC fan and pushing him in the chest after the nail-biting game.

In the Downing Centre Local Court on Thursday, his barrister, Brendan Green, entered a guilty plea on behalf of his client who was not present.