UEFA has fined Celtic £10,000 over the conduct of their players and supporters during a Europa League game away to Fenerbahce in December.
The Scottish giants were charged after fans let off flares during the group-stage match, which ended in a 1-1 draw in Turkey on December 10.
The club have been found guilty of breaching two UEFA rules, one in relation to the flares and the other for the team picking up five yellow cards during the game.
This is now the eighth time in just under four years that Celtic have been punished for their conduct in European competitions.