Pep Guardiola faces an anxious wait to see if record signing Riyad Mahrez will miss the start of Manchester City’s season.

The Algerian was forced off after just 27 minutes of City’s final game of their three-match tour of United States against Bayern Munich and returned to England on Sunday morning using crutches and wearing a protective cast.

Mahrez went down after just five minutes under a challenge from Bayern’s American defender Chris Richards and was able to continue, though the £60 million arrival from Leicester was forced to admit defeat when the problem flared up again.

Mahrez will be checked out by City’s medical team but the 27-year-old could be a doubt for Sunday’s Community Shield encounter with Chelsea.

Guardiola said after the 3-2 victory over the German champions: “I don’t know [the extent]. I wasn’t in the locker room. It was his ankle. We will see.