Arsenal defender Shkodran Mustafi could be out for some time after suffering a thigh muscle injury in Germany's 5-1 World Cup qualifying win over Azerbaijan on Sunday, Germany coach Joachim Loew said.
Mustafi had to be taken off after 36 minutes when he was injured in the build-up to Azerbaijan's equaliser, grabbing his right thigh in pain with no opponents near him.
"With Mustafi it seems that it is some muscle tear or some muscle fibre tear," Loew told reporters. "In any case it could force him to a longer break."
Germany have qualified for next year's World Cup with a perfect campaign of 10 wins from 10 matches.