Nou Camp injury means Emirates youngster faces time on the sidelines but the Gunners have only one recognised keeper at the club.
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Arsenal goalkeeper Wojciech Szczesny fears his finger injury may rule him out for the rest of the season.
The 20-year-old dislocated his finger before half-time in the 3-1 Champions League defeat to Barcelona.
The Poland international has established himself as Arsenal’s number one in recent weeks after spending last season on-loan at Brentford.
But he is worried his season could be finished if he has also damaged tendons around the injury.
He will have tests today on the hand to discover the extent of the problem but is anxious about the recovery time needed.
“Let’s hope it’s not as bad as it could possibly be,” said Szczesny after the Barcelona game. “Of course, I am worried I might be out for some time.
“It is part of the game and there is nothing I can do at the moment.
“I knew straight away I would have to come off and spent half-time with the doctor trying to find out what is wrong with my finger.”
The injury has left Manuel Almunia, who replaced Szczesny at the Nou Camp, as the only recognised goalkeeper still at Arsenal.
Lukasz Fabianski is already ruled out for the season following shoulder surgery, while youngster Vito Mannone and James Shea are on-loan at Hull City and Southampton respectively.
If Szczesny’s injury is as bad as feared, Arsenal could apply to the Premier League to sign a goalkeeper on emergency loan.
Manchester City brought in Marton Fulop in the same way last season following an injury to Shay Given and Joe Hart being out on-loan at Birmingham City.