UEFA has charged AEK Athens and Ajax over crowd trouble that marred their Champions League match in Athens on Tuesday.
Riot police clashed with Ajax fans in the Olympic Stadium before the Group E match, leaving some supporters with blood pouring down their faces, while flares were thrown inside the stadium.
The UEFA charges facing AEK include a pitch invasion by fans, the throwing of objects, setting off of fireworks, insufficient organisation and the display of an illicit banner.
Ajax have been charged with setting off fireworks and the throwing of objects by their supporters.
The governing body's Control, Ethics and Disciplinary Body will deal with the case on Dec. 13.
Former European champions Ajax beat AEK 2-0 to reach the knockout rounds of competition, while AEK were eliminated after a fifth straight defeat.