Brentford boss Dean Smith admitted there's no time scale on the return of full-back Callum Elder.
The on-loan Leicester man sustained an injury in last weekend's 2-0 away win at Brighton following a collision with Glenn Murray and had to be taken off at half-time.
Smith said that his injury was yet to be fully diagnosed and that they would assess the situation in a fortnight to see when he couple be set for a return to action, although sources believe it will not be until the end of November.
The Brentford head coach said: "No (there's no timescale on his return), he's in a brace at the moment so can't put any weight on it and then I'm not sure what the exact injury is.
"It's a knee injury on the medial side but I think he's going to be out for at least a couple of weeks and then we'll see where we are from there."
Both Andreas Bjelland and Yoann Barbet provided cover for the injured Elder in Saturday's 5-0 thrashing.
"Bjelland started the game before being taken off midway through the second half for Barbet and Smith was pleased with both their contributions.
He added: "It's not his natural position and it's not Yoann Barbet's natural position either. But Callum will be out for a number of weeks so these are the lads we've got at the moment. But they're both good footballers and they've both got good tactical awareness so they don't get beat too easily."