Arsenal manager Arsene Wenger says defender Mathieu Debuchy will be sidelined for three months if surgery is required to rectify his ankle problem.
The full-back was taken off on a stretcher against Manchester City last week and is expected to be ruled out for at least six weeks, twice as much if results show that surgery cannot be avoided.
"He [Mathieu Debuchy] has an exploration of his ankle on Friday night and they go in and look how the ligament is damaged, and after that we know if he does need surgery," Wenger told reporters during his press conference.
"If he doesn't, it'll be six weeks, if he does need surgery it'll be three months. At the moment we don't know.
"He [Nacho Monreal] will miss the game on Saturday. It's his back and it's always difficult to predict [the length of absence with those injuries], we don't really know. I don't think it will be long-term."
"He [Yaya Sanogo] has a small hamstring problem and is not in the squad."
Midfielder Jack Wilshere was a major concern after suffering an ankle injury in mid-week against Borussia Dortmund but the Frenchman says he joins Calum Chambers and Mathieu Flamini in the squad to face Aston Villa.
"We have [Calum] Chambers back because he had tonsillitis and wasn't available.
"And everybody who started the game will be available again. Flamini's back as well because he wasn't on the team sheet. He's back and available.
"He's [Jack Wilshere] available too.
"I was wrong [after the Dortmund game], it was his left ankle and it was only a click that made him turn his ankle a bit, so he's alright."
