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Arsenal's captain Martin Odegaard was forced to leave the pitch during a match against Nottingham Forest due to what seemed to be a recurrence of his shoulder injury.
Despite their title hopes being hit with a 1-0 loss at Liverpool the following week, the Gunners' skipper managed to play for 20 minutes.
Following this, Odegaard played for 45 minutes in Norway's 1-0 friendly win over Finland before playing the entire match against Moldova.
Mikel Arteta did not hesitate to start Odegaard against Forest in Saturday's early kick-off
However, the former Real Madrid prodigy only lasted 18 minutes and is now a serious doubt for their crucial matches against Athletic Bilbao and Manchester City next week.
Timber and Gibbs-White both slid in for the ball, which Odegaard was also attempting to win
Although Timber emerged with the ball, Odegaard went flying and landed awkwardly on his right shoulder, immediately crying out in pain.
Following treatment, Odegaard battled on for 10 minutes before being forced to withdraw from the action.
Ethan Nwaneri was introduced as his replacement, charged with breaking down Forest's resolute defensive structure under newly-appointed manager Ange Postecoglou.
However, it was a different midfielder who found the breakthrough.
Martin Zubimendi demonstrated precisely why Arsenal invested big money in his services, as he delivered a devastating volley from the penalty area's edge that rocketed past Matz Sels with the aid of a minor deflection.
Martin Odegaard receives treatment