Arsenal manager Arsene Wenger has admitted that he is uncertain how serious Danny Welbeck's injury is after the striker was forced off during the side's goalless draw at Chelsea this afternoon.

The former Manchester United forward came off in the 73rd minute of the encounter at Stamford Bridge following a collision with Blues defender David Luiz.

Speaking after the game, Wenger confirmed that Welbeck had suffered "a groin problem" and will now face a medical assessment.

"I don't know how severe it is," he told the Evening Standard. "It looks like it is a 'good' groin problem. Not an easy one."

Welbeck has featured in all five of Arsenal's Premier League games so far this season, contributing three goals.