Theo Walcott has been ruled out of Arsenal's Champions League match against Montpellier on Wednesday night with a shoulder problem.
The England striker sustained the injury during Arsenal's 5-2 derby win over Tottenham at the weekend but was able to play on and scored the Gunners' fifth goal in injury-time at the end of the match.
Arsenal boss Arsene Wenger revealed Walcott had not trained Tuesday and would have a scan to determine the extent of the injury although he thought it would be short-term.
Wenger hopes Walcott's problem will not prove too severe.
He said: "The injury he got during the game with his shoulder, we have to scan that today and see if there is no damage. He will be out for tomorrow. It should be short-term.
"We will miss [Andre] Santos as well, who has a muscle strain in his abdomen. The two players coming in the squad are Gervinho and [Kieran] Gibbs.''
Walcott, 23, has yet to agree new deal at Arsenal, and as such could leave at the end of the season on a...