Arsenal defender Calum Chambers has suffered a major blow, with his knee injury set to rule him out for up to nine months.

Chambers has been ruled out for the rest of the season with a serious knee injury, Arsenal have confirmed.

The centre-back ruptured the anterior cruciate ligament of his left knee during the defeat to Chelsea on December 29, and underwent surgery in London on Thursday morning.

A club statement read: "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."