Fulham are concerned that new goalkeeper Maarten Stekelenburg may need surgery to recover from his shoulder injury, according to SkySports.
The 31-year-old signed from Italian giants Roma over the summer but picked up an injury in his sides opening day win over Sunderland and hasn't featured since.
The Dutch international stopper returned to training recently only for the shoulder problem to flare up again.
"If it is not right in two weeks' time, then he will probably need an operation," said his manager at Craven Cottage, Martin Jol.
"It's already five weeks now, so it's certainly long term.
"He had a few injections in his shoulder and it's quite sensitive.
"He trains but when he stretches he feels a lot of pain, so we have to be very careful."
Stekelenburg was signed as a replacement for veteran goalkeeper Mark Schwarzer who moved to west London rivals Chelsea as back-up to Petr Cech.
Jol will be keen to get the 'keeper back, David Stockdale has been filling in between the sticks.
However, the Cottagers have struggled for form this season and haven't won since that first game at the Stadium of Light in the Premier League.
They are in 18th place but returned to form with a win in the League Cup this week against previously unbeaten Everton.
Jol's side welcome newly promoted Cardiff City to the capital this weekend.
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