Martin Ødegaard 's early season injury woes continued on Saturday when he was forced off in the 18th minute of Arsenal 's 3-0 win over Nottingham Forest .

Ødegaard's frustration will be compounded by the fact his injury was prompted by a collision with his own teammate at the Emirates.

The Arsenal captain fell awkwardly after Jurriën Timber inadvertently made contact with Ødegaard while attempting to win the ball from Forest's Morgan Gibbs-White on the edge of the penalty area.

Ødegaard left the pitch holding his shoulder -- an injury he first suffered during Arsenal's win over Leeds United on Aug. 23. The shoulder issue also meant he was not included in Arsenal's starting XI for the 1-0 defeat at Anfield before the international break.

He was replaced by Ethan Nwaneri .

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