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.
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