Arsenal captain Martin Odegaard is expected to be sidelined for a further six weeks with knee ligament damage.
Odegaard, 26, was forced off in the 30th minute of Arsenal's 2-0 win over West Ham before the international break.
The Norwegian sustained the injury in a clash with Crysencio Summerville in what manager Mikel Arteta described as a 'knee on knee' collision.
Arsenal did not initially disclose the timeframe for the midfielder's recovery, only confirming that he had done damage to the medial collateral ligament in his left knee.