Pontus Jansson is unlikely to feature again this season.
The defender was withdrawn in the 16th minute of Brentford’s 2-1 defeat to Newcastle United last time out with a hamstring injury.
It’s a fresh setback for Jansson who has only featured in 12 games this term.
“It’s a hamstring injury that will most likely keep him out for the rest of the season,” Thomas Frank revealed at his press conference ahead of Saturday's trip to Wolverhampton Wanderers.
“It’s bad news for us and for Pontus. There’s a small chance [he returns], but it’s a big one unfortunately.
“I would prefer to have Pontus, no doubt about that. He’s our captain and a very important player for us. It’s a setback, but it is what it is, and we have to deal with it.”
Frank was full of praise for the job that Julen Lopetegui has done at Molineux since his appointment in November.
Wolves have taken four points from their last two fixtures and beaten Chelsea, Tottenham Hotspur and Liverpool on home soil in recent months.
“We are going to Wolves, a very difficult place,” Frank continued.
“They look very stable, and they look like a very good team. They have some top players in the team – Chelsea went there and lost 1-0 – so we know it’s going to be a tough task.
“They are very fluid and I like the rotation they have with their two or three midfielders, depending on how Lopetegui is doing it. They have wingers who come inside. They are playing with bigger intensity now than earlier in the season. It’s a team that, on their day, can beat anyone.”