AEK Athens has been ordered to play two home games in an empty stadium after ticketless fans rioted at an away match.
The club was also fined 60,000 euros by the sports disciplinary committee. The violence erupted on Sunday at Levadiakos, around 80 kilometres from Athens, when AEK supporters turned violent after being refused entry. Fourteen policemen went to hospital with light injuries sustained during the clashes.
A television station's broadcast van was also destroyed and several cars damaged.
Referee Dimitris Kalopoulos interrupted the match for 20 minutes after players and spectators were affected by the tear gas used by police outside the stadium.
AEK won 1-0.
Three fans were arrested, tried and given 33-month sentences - suspended for three years. The court ordered the trio to report to a police station for every AEK home game in the next two years.
The Athens club hopes for more arrests following the club Web site's publication of more than 30 photos of alleged hooligans. The unprecedented step was taken by AEK owner Demis Nikolaidis, a former star player at the club.
Leviadakos was fined 10,000 euros.