Arsenal crock Mesut Ozil carried his injured hamstring for over 20 minutes against Bayern Munich on Tuesday night.
The Daily Star says he suffered the injury midway through the half.
It was only at the break that Ozil felt the discomfort and pain increase, and boss Arsene Wenger replaced him with Tomas Rosicky.
Boss Arsene Wenger is expected to confirm today the playmaker will be out of action for at least three weeks, missing key league games at Tottenham and Chelsea and Manchester City at home.