Emirates shot-stopper will miss crucial period in season following Nou Camp injury.
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Arsenal goalkeeper Wojciech Szczesny will miss the next six weeks with the finger injury he picked up against Barcelona.
The 20-year-old dislocated his finger when saving a Dani Alves free-kick after just 18 minutes in the Champions League tie.
Lukasz Fabianski has already been ruled out for the season with a shoulder injury, leaving Manuel Almunia as the only recognised keeper at the club.
Manager Arsene Wenger wants to recall Vito Mannone from his loan spell at Hull City, but the Italian is also on the casualty list.
Youngster James Shea is on-loan at Southampton and untested at the top level, so the Ginner’s boss may be forced to move into the emergency loan market.
“We have Wojciech out, in my opinion for six weeks,” Wenger told the club’s website. “We have Fabianski out for the rest of the season.
“We need absolutely some cover in goal.
“We need now an experienced goalkeeper as cover for Almunia because Mannone is out for six weeks so we cannot call on him.
“Mannone is here at the training ground having treatment but he cannot play for the next six weeks. We can call him back [from Hull City] but he is not available.”