Asteras Tripolis's Europa League game at home to APOEL was interrupted after flares were thrown onto the pitch.
The hosts were leading 2-0 when the referee called both teams off the pitch in the 68th minute.
A number of players had been forced to remove objects from the field of play throughout the game before the match officials halted proceedings.
Following an interval of almost 20 minutes, the match restarted once more after the authorities had cleared the playing surface.