Arsenal defender Calum Chambers will be out for between six and nine months after rupturing the anterior cruciate ligament of his left knee against Chelsea on Sunday, the club have announced.

The club confirmed the injury in a statement released on their official website on Thursday.

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Chambers, 24, who has made 18 appearances in all competitions this season, has already undergone successful surgery on Thursday.

An Arsenal statement said: “Further to the injury sustained during the match against Chelsea on Sunday, we can confirm that Calum ruptured the anterior cruciate ligament of his left knee.

“Calum has had successful surgery in London on Thursday morning. The rehabilitation process is expected to take between six to nine months.

“Everyone at the club will be supporting Calum to ensure he is back on the pitch as soon as possible,” Arsenal stated.

Following the injury to Chambers, when asked what fans can expect from Arsenal in the winter window, new manager Mikel Arteta said: “That we will try to be in the market to see options that can strengthen the team, that’s for sure and our obligation and we will be working on that.

“My obligation is to give my opinion on the things we can improve. Obviously we have a bad injury with Calum a few days ago that will change our plans at the back.”

The Arsenal manager added: “The reality is we will not be able to do much. I’m more concerned about getting players back from injury and try to improve the players I have here, get everybody on board and understanding what we’re trying to do.

“And if something extra comes up and we think it is the right opportunity to improve what we have, then let’s do it.

Meanwhile, Arsenal hope left-back Kieran Tierney will return to training in March after undergoing surgery on the dislocated shoulder he sustained in the 3-1 win over West Ham on 9 December.

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