Tony Mowbray has provided an injury update as part of his weekly pre-match press conference.
The Blues are preparing to face Bradford at Ewood Park on Thursday evening, and have had five players away with their respective countries.
Meanwhile, loanee Harry Chapman was forced off just 10 minutes into the Under-23s Premier League Cup clash against Aston Villa earlier this month.
Asked to provide an update, Mowbray said: "The injury situation has cleared up a bit in recent weeks, so I've good a good selection headache.
"The international lads, bar Charlie Mulgrew who is still away, have been training and look sharp.
"Training has been intense, which isn't always easy when you have such a big gap between games and nothing to target.
"The situation with Charlie being away until tonight [Thursday night] isn't ideal, but it is what it is. We'll deal with it and see how he is when he gets back.
"I'm very mindful of how important he is to our team, so we'll leave it as late as possible [before making a call].
"As for Harry, he's back at Middlesbrough at the moment. It's a grade two hamstring strain.
"It's not the same injury hehad before, but we'll probably have to finish the season without him.
"He's still very young and has a big future ahead of him.
"Ryan Nyambe is back on the grass, he's had his boots on and has been running. He's still a few weeks away.