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Arsenal midfielder Cesc Fabregas is set to have a scan on his injured hamstring on Monday, and is reportedly facing as long as a month out of action.
The Gunners playmaker was forced out of the 1-1 draw with Sunderland on Saturday evening - having scored a bizarre opening goal - after less than half an hour.
The Spaniard, who did not return to domestic action at the start of the season due to his country's World Cup winning exploits, has had previous problems with hamstring injuries.
Arsenal manager Arsene Wenger is already without injured pair Theo Walcott and Robin van Persie, who could both still be over a month away from full fitness.