Nottingham Forest have announced Olympiakos owner Evangelos Marinakis has completed his takeover of the club.
Vladan Ivic was taken to hospital for treatment after the incident, which followed a 54th-minute brawl involving several players.
PAOK won the Greek Cup by defeating AEK Athens 2-1 in a final marred by violent clashes between fans that injured more than 40 people, two seriously.
Olympiakos clinched a record 44th Greek league title with a round to spare, and their 19th in the last 21 seasons, after thrashing Giannena 5-0.
Nery Castillo has announced his retirement from the sport to take on a new venture, Nery's Fishing, a store in Greece dedicated to anglers.
Greek league leader Olympiakos have fired former Portugal coach Paulo Bento as manager after a third straight league defeat.