By Editor Wayne Veysey| Former Evening Standard, Press Association and Goal chief correspondent with 17 years experience of breaking big stories, including exclusives like this

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Arsenal fear Alex Oxlade-Chamberlain could be out for two months with knee ligament damage, Football Insider sources understand.

The England international underwent scans on Wednesday after damaging his right knee in a challenge with Javier Mascherano in the Gunners’s 2-0 Champions League defeat to Barcelona on Tuesday night.

An Arsenal source has told Football Insider that the medical team fear Oxlade-Chamberlain has damaged ligaments and could face a lengthy spell on the sidelines.

The midfielder left Emirates Stadium on crutches with heavy strapping and has already been privately ruled out of Sunday’s Premier League clash against Manchester United at Old Trafford.

Arsenal are expecting the results of Oxlade-Chamberlain’s scans on Thursday but the likelihood is that he is will be ruled out for around six to eight weeks.

A lengthy lay-off is a huge blow at a time when the 22-year-old had showed signs of a return to form after a difficult 2015 in which he did not score a single Premier League goal.

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Oxlade-Chamberlain was given the nod to start ahead of Theo Walcott, Danny Welbeck and Joel Campbell against Barcelona, and had also been in the starting X1 for Arsenal’s last two Premier League matches.

He is also set to become the latest in a series of Arsenal’s players to be ruled out with a serious knee injury this season, following Welbeck, Francis Coquelin and Santi Cazorla.

In other Arsenal injury news, Gabriel is facing an uphill battle to be fit for the trip to United on Sunday.