Arsenal's Mustafi comes off against Stoke with apparent hamstring issue

Arsenal centre-half Shkodran Mustafi was forced off during the 25th minute of Saturday's Premier League clash with Stoke City at the Emirates with an apparent hamstring injury.

It's bad news, good news for Arsenal supporters as the German World Cup winner came off for Hector Bellerin, who returns to first-team duties after missing six matches in all competitions with an ankle worry.

Related: Bellerin returns from injury to make bench vs. Stoke City

Gabriel, who deputised for the pacey Spaniard at right-back, shifts inside next to Laurent Koscielny, with Bellerin assuming his usual position out wide.

Mustafi collapsed to the pitch in the 22nd minute, clutching at his leg before motioning to the touchline for assistance, and was promptly replaced by Bellerin, who's making his first appearance since the Oct. 6 north London derby with Tottenham.

Arsenal, which hasn't tasted defeat in the league since an opening goal fest with Liverpool, relinquished a penalty minutes later when Granit Xhaka's elbow caught Joe Allen in the area. Charlie Adam stepped up and buried the fifth penalty conceded by the Gunners this campaign.