The boss revealed a fresh concern for Sead Kolasinac as the full-back picked up a hip injury while playing for Bosnia and Herzegovina during the global break.
To make matters worse, the goal which say Peru equalise and earn themselves a spot in the top five was from an indirect free-kick, which only stood because goalkeeper and Arsenal team-mate David Ospina made contact with the ball before entering the net.
Ozil could feature at Watford, having returned to training following a knee injury.
"We won our first game of the season at home and I thought we'd be alright and then went to Crystal Palace".
Sanchez was unable to inspire Chile as La Roja finished sixth in Conmebol's qualification group, missing out on what would have been their 10th World Cup finals. "Yesterday afternoon I watched the whole Brazil against Chile game to see how hard the game was. I hope the situation can be turned around".
"I will have to speak to him", Wenger said.
The Frenchman is now managing a defensive injury crisis following the worldwide break.
Key duo, Shkodran Mustafi and Sead Kolasinac picked up knocks whilst away in the last week, with Mustafi picking up what seemed a serious muscular injury during Germany's game against Azerbaijan.
Merson feels that Ozil should be dropped against Watford regardless if he is fit or not.
The former midfielder has even described the recent Arsenal side as an Under-12's team, and it looks like the Frenchman has had enough, I'm sure this won't be the last time we hear about the rift between Wenger and Merson.
Koscielny has not yet featured in the Europa League this campaign, but he just might well need to if Wenger decides to include him in the squad that travels to Serbia on Thursday. At the moment, he's not available.
"At the start, maybe I was a bit nervous to work alongside him".
"I haven't seen everybody, because some players are coming back today and some are in tomorrow [Friday], like Alexis", the 67-year-old said. He trained on his own and the first signs are positive, so we chose to give him a test tomorrow.