Midfielder Ryan Williams, who has made just one start this season due to injury, has aggravated his old groin problem. Lee Johnson said: "It is extremely frustrating. He obviously has a serious weakness there and we have to go back to the drawing board."
Adam Hammill is expected to miss the next four weeks after limping off with a knee problem on Saturday. Johnson said losing the winger was 'like Real Madrid losing Cristiano Ronaldo.'
Left-back Aidy White, who missed the last two matches, is also going to be out for several weeks. Centre-back Alfie Mawson came off with a groin problem at Bradford on Tuesday with the extent of that injury yet to revealed. Lewin Nyatanga has also been out injured.
Johnson said: "The injuries have killed us a little bit. We are really down to our bare bones. We need to be lucky with injuries now because we already have five or six."