EXCLUSIVE | By Editor Wayne Veysey

Arsenal fear Aaron Ramsey’s latest hamstring injury could keep him out for up to a month, Football Insider sources understand.

Ramsey pulled a hamstring during the Gunners’ 2-0 Champions League victory over Bayern Munich on Tuesday and was immediately substituted at the 57-minute mark.

Arsene Wenger admitted afterwards that Ramsey would be sidelined for an unspecified period.

“He [Aaron Ramsey] is alright but very down because he told me that his hamstring is quite a tough one. He’s out,” Wenger said.

The midfielder will undergo scans on his leg on Wednesday to confirm the extent of the injury but Arsenal do not expect him back in action for at least three weeks.

This would rule him out of the team’s next five fixtures, including the Champions League trip to Bayern in a fortnight and the north London derby at Emirates Stadium on 8 November, as well as Premier League clashes against Swansea and Everton.

The latest Ramsey injury comes after he missed large chunks of last season with three separate hamstring problems.

He first injured the muscle on 27 September, 2014, to miss three weeks, and when it went again at Galatasaray on December 9, he was out for almost six weeks. The third hamstring injury was sustained against Leicester City on February 10 and kept him out for three weeks until he returned as a substitute against QPR on March 4.

Red alert: Alexis Sanchez is exhausted after heavy programme

Red alert: Alexis Sanchez is exhausted after heavy programme

Ramsey has been a virtual ever-present for Arsenal this season, with Wenger using him predominantly on the right flank rather than in his favourite central position.

Meanwhile, Wenger also revealed that Alexis Sanchez could be taken out of the firing line for Saturday’s evening kick-off against Everton.

The Chilean was substituted after 82 minutes of the Bayern match after running himself into the ground.

Wenger said: “Alexis? You could see he was jaded physically. He still pushes himself to much and finished exhausted. Two games with Chile, plus travelling plus Watford and tonight. It’s too much.”