The player was expected to be out until mid-November but has seemingly come back to fitness ahead of schedule this week.
Browsing: Hamstring Injury
The Frenchman came off the bench in the club’s disappointing 2-1 defeat to Cadiz in LaLiga on Sunday but underwent tests after the match.
The 28-year-old Mustafi sustained the injury during the closing stages of Arsenal’s 2-0 semi-final victory against Manchester City at Wembley last week.
Michael Obafemi has been ruled out for the remainder of the season through injury.
The Lions have revealed that they expect the Nigeria international back in action within three weeks time.
The France international suffered the problem during Sunday’s 4-2 win at Real Sociedad, which saw him come off the bench to replace Paulinho midway through the second half.