Panathinaikos have been fined and docked points for the riot which halted last weekend's derby clash with Olympiacos.
The match was abandoned nine minutes before full-time after Pana fans lit fires around the stadium and threw missiles and flares at police.
Pana have been fined €252,000 and must play their next four home games - against Aris, Panionios and Panetolikos and the first home game of the play-offs - behind closed doors.
They have also been docked three points for this season and will start next term on minus two.
Olympiacos were awarded a 3-0 win and now have a 10-point lead at the top of the Super League with just five games to play.
Panathinaikos can appeal the decision but will have to foot the bill for the damage caused to the Olympic Stadium on Sunday.