Gabriel Paulista is also sidelined with ankle ligament damage and Koscielny’s late return to training following France’s run to the final of Euro 2016 means Arsenal could begin its Premier League campaign against Liverpool on Sunday fielding the inexperienced pairing of Calum Chambers and Rob Holding at the heart of defense.

Wenger is in the market for reinforcements at center back, with Mertesacker’s compatriot Shkodran Mustafi heavily linked with a move from Valencia to Emirates Stadium over recent days.

Meanwhile, midfielder Jack Wilshere voiced his approval for the new captain’s appointment.

“It is good news for us. For me anyway, over the last few seasons he has been like a captain,” the England international told Arsenal Player. “He is a natural leader and I know he has picked up an injury, but he can still bring so much to us as a team. I’m sure if you ask the other boys, they will say he would be an obvious choice for captain. We are happy.

“He is organized and he won’t take any nonsense from anyone. If someone is late or on their phone, he is on to them – it doesn’t matter who you are. He is the one who organizes our team dinners, so for me he is a great choice.”