That is a major setback for Arsenal and also for Mustafi whose turnaround in fortunes under Arteta has been remarkable to looking like he was on his way out to now being a first choice centre half.
“The rest is true that Musti is injured and we need to assess a little bit how long he is out," said Arteta who was then asked whether he would be fit for the final.
“I doubt it. I don't know. We have to see how he evolves in the next few days. At the moment, I doubt it."