The Arsenal boss has defended his fitness team despite a long list of injuries.
The German got injured against Chelsea but a diagnosis was only made later, with Arsenal boss Wenger explaining that the Gunners did not notice a serious injury at the time.
And the Frenchman says he is 'deeply shocked' by the news that Ozil will miss months of the Premier League season.
He did, however, defend his side's setup, saying that the injuries are in no way due to a lack of preparation.
"I said to our physio to keep an eye on him and if there was anything wrong with him, tell me because when you’re 1-0 down, you want to keep your offensive players on the pitch," Wenger told beIN sports, as quoted by the Daily Mail.
"I am deeply shocked. He wasn’t involved in a collision with anybody.
"It was just after making a pass with the outside of his foot that he injured his leg so it’s very hard to believe that you can damage your ligament with just making a simple pass and it’s very difficult to take that he will be out for a while.
"You cannot say our injuries are preparation mistakes. The big injuries we have are really accidental.
"Scientifically we are quite good. We have been hit hard after seven games. I would never have thought we would have had so many bad injuries."