Ilkay Gundogan was confirmed as being set for a long spell on the sidelines after injuring his knee in the 2-0 win over Watford.
The former Borussia Dortmund midfielder limped off in tears just before half-time after sustaining what now appears to be a serious injury.
Pep Guardiola confirmed the bad news at his post-match press conference against Watford as well as his City v Arsenal pre match presser.
“This is so, so difficult for him. Sad for him. We are going to miss him a lot. It’s what it is. He’s unlikely, sometimes football is like this."
“Now we need him to feel we are there and wait and come back safe. He’s going to be operated and be back as soon as possible.” said Guardiola.
"When his physical condition is right, he can do everything. When he came back, the three games he played we won with him."