Arsene Wenger has confirmed William Gallas will miss the rest of the season with a medial knee ligament injury.
Gallas was forced off with the problem in the first half of Arsenal’s 1-1 draw with Villarreal in their Champions League quarter-final on Tuesday.
The Frenchman picked up the knock after colliding with Villarreal striker Giuseppe Rossi.
Goalkeeper Manuel Almunia also faces a spell on the sidelines after suffering an ankle injury in midweek.
The Spaniard was forced off after he was also, coincidentally, caught by Rossi in the first half.