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, with a goal difference of plus 39, better than Spain's 10 victories and plus 23 goal difference from their campaign before the 2010 World Cup.

Leon Goretzka scored twice, including a brilliant backheel, with Sandro Wagner, Antonio Rudiger and Emre Can also netting.

Mustafi is helped from the field credit: Getty images

Schalke midfielder Goretzka said: "I think we were very consistent throughout the qualifiers and we deserved to qualify with a perfect record.

"I was happy with my role in the Confederations Cup, but now I think it's time to play a big role in a big tournament like the World Cup."

Goretzka opened the scoring with a clever backheel, but Ramil Seydaev levelled before the break.