Serbian champions Partizan Belgrade must play their next two European home games in an empty stadium as punishment for fan racism and crowd unrest.
Partizan were charged by UEFA with various offenses including racist behavior, firework use, and pitch invasions following two Champions League qualifying games against Olympiakos and Montenegro's Buducnost.
Besides the two-game empty stadium ruling, UEFA also hit Partizan with one more game behind closed doors, suspended for three years, and a fine of €130,000.
Partizan beat Buducnost 2-0 on aggregate, but lost to Olympiakos 5-3 over two legs in the next round.
Their first game behind closed doors will be a Europa League playoff round meeting with Hungarian club Videoton on Aug. 17.