Injury blow for Kahn
The German titans are on the verge of being knocked out of the Champions League, after slipping to a 2-1 defeat at Milan - a game in which Kahn was forced from the field of play shortly after half-time.
Kahn is not sure how serious his thigh injury is, but he will definitely miss the weekend clash with Hannover.
He said: "I twisted my knee as I landed and suddenly felt a stabbing pain.
"We'll have to wait and see how it develops. There's still some bruising. But maybe I'll be fit again in a week."
The 33-year-old will now face a race against time to be fit for the Champions League clash with Deportivo La Coruna next week.