Ridgewell concern for Baggies
West Brom are facing a potential full-back crisis for Sunday's derby at Aston Villa, with Liam Ridgewell joining the casualty list.
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Former Villa player Ridgewell became the latest casualty when he limped out of Wednesday night's Capital One Cup home tie with Liverpool mid-way through the first half with a thigh injury.
Steven Reid (hamstring) and summer signing Goran Popov (groin) are also currently out of action.
It leaves Billy Jones as the only fully fit full-back available to face Paul Lambert's side.
Clarke confirmed: "Liam felt something in his calf and went off and it left us a little bit short in the full-back area because we already had Reid and Popov out.
"It is a concern for the weekend. I'm sure Liam would be desperate to play (against Villa). It would be a blow to lose him because he has played every game for us this season.
"He is one of the steady players in the team. It would be disappointing for Liam but disappointing for us as well.
"We sit everyone down, assess what we've got, and if I can get one or two from the treatment room onto the training pitch, we'll do that.
"If not, we'll just deal with it."
Reid has not played since suffering his setback against Everton four weeks ago while Popov has yet to feature for the Baggies.
Jones started at right-back against Liverpool but switched to the other flank after Ridgewell's departure - with centre-back Craig Dawson having to fill his previous role.
He is now looking for the Baggies to bounce back from their cup exit by triumphing at Villa Park.
Jones said: "We had a disappointing result against Fulham two weeks but we came back and won at the weekend against Reading.
"That's the sign of a good team and, if we can do that again on Sunday at Villa, that would be great.
"After the disappointment of losing a game, it's good to taste that winning feeling again as soon as possible.
"It was disappointing losing last night but we will go into the big derby and hopefully get another three points.
"We've only got three days and then we're playing the derby. It will come around quickly and we're looking forward to it."
Jones is disappointed the Baggies bowed out of the cup against a youthful Liverpool side after taking the lead through Gabriel Tamas before being hit by a brace from Nuri Sahin.
He said: "We were disappointed at half-time because we made such a good start and kicked off at a really great tempo.
"We have talked about turning The Hawthorns into a fortress, making really quick starts and making teams feel uncomfortable, and when we were 1-0 up after 10 minutes we seemed to have succeeded.
"But then we didn't kick on and the first half at times was a little bit disappointing.
"We let them get back into the game and control the game at times.
"It was good to improve in the second half but we're not happy with losing the game.
"We wanted to do well in this competition this year, but we will look at the positives for the season so far and take them into the big derby on Sunday."