Arsenal will miss striker Emmanuel Adebayor for three weeks due to an ankle injury he sustained in last weekend's 2-1 defeat at Stoke City. "Adebayor will be out for three weeks," Gunners boss Arsene Wenger told a news conference ahead of Wednesday's Champions League game with Fenerbahce. The Togolese is set to miss Arsenal's crunch Premiership encounter with Manchester United on Saturday. In the same context, Wenger revealed that winger Theo Walcott will miss the Fenerbahce clash, following shoulder surgery. "Walcott could be days or weeks. It is the shoulder he had the surgery on. We don't know about (William) Gallas yet but (Bacary) Sagna will be back in the squad," added Wenger. Arsenal were rocked by injuries at the Britannia last Saturday, which prompted the fury of Wenger towards the newly-promoted Potters.