Arsenal manager Arsene Wenger says there are no fresh injury worries ahead of today's Premier League match against Chelsea.
The Gunners were surprise losers on the opening day of this season's Champions League group stage after they lost 2-1 away at Dinamo Zagreb.
Midfielder Aaron Ramsey and defender Hector Bellerin were not in the squad to face the Croats but they are both expected to start against the Blues.
"We have no injuries and we left [Aaron] Ramsey and [Hector] Bellerin behind [for the Zagreb game]," Wenger said on Friday.
"They integrate into the squad again. Mertesacker may still be a bit short, I have to decide that today [Friday].
"[For Mertesacker] it was an illness.
"He [Jack Wilshere] will have surgery next week and it is a blow, a big problem. But on the short term only because it does not damage his future."