Boss Gary Bowyer may need to take a roll call before naming his squad for Saturday's FA Cup clash with Charlton Athletic.
Rovers could be without several key players for the match at the Valley with injuries taking their toll over the festive period.
To add to the selection headaches for the manager, a virus sweeping through the camp has laid low several players, leaving the squad stretched.
Speaking on Tuesday Bowyer said: "Like I said after the game on Saturday it is a little bit like A&E at the moment.
"We've had a few off ill today, they've not reported in for training. There's been a virus that has been spreading throughout - we missed Josh King on Saturday through it, others have had it and there's been a couple today that have not shown because of it as well."
Markus Olsson, who limped off with a leg injury in Saturday's draw with Middlesbrough, is a major doubt, Corry Evans serves the second of his two-match ban, whilst Lee Williamson will also be assessed in the run-up to the cup match after coming off with a head injury at the weekend.
Bowyer added: "Markus hasn't trained because of the injury sustained on Saturday. He made an outstanding tackle and he hurt his leg.
"It has got swelling and bruising on the bone so we'll just have to see how he goes with that.
"We've also had to look after one or two others that have been carrying knocks, aches, pains, and strains over the last couple of weeks.
"So we are going to have to utilise the full squad this weekend that is for sure.
"It something that we've grown accustomed to, but it isn't ideal. But whoever puts the shirt on will be giving it a right good go."
Two players that could come into the manager's thoughts are Jack O'Connell and John O'Sullivan.
The pair have returned to the club from loan spells at Rochdale and Accrington Stanley respectively and could come into contention for a place in the squad at the Valley.
"At this moment in time they are certainly going to come into consideration because of the numbers that we've got missing," added Bowyer.
"We've monitored them closely and spoke regularly with the managers that they are at. They've been pleased with them and they both wanted to keep the players so that is a sign that they have done well.
"But it might be something that we'll have a look at and play them on Saturday, but we'll wait and see, and see if people recover."
Tickets for Saturday's match will be on sale at Ewood Park until 4.00pm Friday. Tickets will be available at the Valley on the day of the game from the South Stand away end - cash only.
Prices are £10 for Adults and £5 Concessions.