Due to return after recovering from a knock to one leg, the former Gunners man has now suffered a similar problem in the other, and seems certain to miss the north London derby
The former France international was due to play against Shamrock Rovers in Thursday’s Europa League tie to assess his recovery from one calf injury, but has now damaged the other one.
“William was looking OK to return but, just when we thought he was over his initial calf injury, he has pulled a calf muscle in the other leg,” his manager, Harry Redknapp, said to The Sun.
“He won't face Shamrock and has virtually no chance of playing Arsenal.
“It's a shame because he turned in a man-of-the-match performance against Arsenal last season.”
Gallas, formerly of Chelsea as well as the Gunners, would have been met with a hostile reception from the opposition supporters in the north London derby on Sunday, having moved to White Hart Lane in 2010.
And with the central defender unavailable, Redknapp has had to rethink his plans for the Shamrock match.
The coach confirmed he would field some fringe players, saying: “I am not putting out my first XI but it will be a team I expect to win.”