The attacking midfielder flagged up the improved fortunes of Scottish teams both at club and national level as reasons to be wary.
"We have played other teams in the Uefa Cup this season and everyone thought we can win 6-0 and we had hard games and won 1-0 or so."
His sentiments were echoed by Bayern boss Ottmar Hitzfield: "Look what happened against Copenhagen, Aberdeen were absolutely excellent."
Hitzfield added: "I think some players had this game on their mind when they played Celtic. They will try to put a lot of pace in the game. We have to aim to keep the ball, set our own pace and dictate the play."