Sanchez is understood to have had an angry exchange with fellow players after leaving training mid-session prior to Saturday’s loss at Liverpool.

He was confronted by team-mates on their return to the changing room as tempers flared.

Sanchez was left out of the starting line-up at Anfield but came on and set up a goal for his side in the second half as Arsenal lost 3-1.

The Gunners face a daunting task as they hope to overturn a 5-1 defeat from the first leg of their last 16 tie to Bayern.

Speaking at yesterday’s pre-match press conference, Arsenal captain Per Mertesacker says he wants to see his teammates put up a good fight.