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Graham Riches, 50, of Dyer Close, Horsford, near Norwich, appeared before the city's magistrates' court, where he admitted the offences.
The three charges related to an incident in Carrow Road after the team's 0-0 draw with Leeds United in the play-off semi-final, on 12 May.
Riches denies a charge of assault by beating.
The case involves an incident when a man reported being punched and suffered a cut to his chin thought to be caused by a drink can being thrown at him.