Besiktas have been fined 34,000 euros (£29,880) by Uefa after a cat wandered on to the pitch during their Champions League last-16 defeat by Bayern Munich in March.
English referee Michael Oliver stopped play in the second half at Vodafone Park until the cat left the pitch.
The Turkish club have been charged with “insufficient organisation”, and have also been penalised for fans throwing objects and blocking stairways.
Bayern won the tie 3-1 on the night.
It finished 8-1 on aggregate as they progressed to the quarter-finals, with fans of the German club voting the cat as their man of the match.