West Bromwich Albion are set to be without Chris Brunt and Abdoulaye Meite for at least the next two weeks.
Brunt limped off in the defeat to Aston Villa with a hamstring problem and will be out for up to a month.
Meite, who arrived from Bolton Wanderers in the summer, suffered a recurrence of an old calf injury in the warm-up to the derby on Sunday.
"They both had scans yesterday," manager Tony Mowbray told the club's official website.
"Brunt has a grade one strain of his hamstring and will be out for three to four weeks.
flying colours
"We haven't yet had the scan results read for Meite but I would anticipate it being two weeks and a bit more.
"He went through a week's training last week and came through it with flying colours after the same sort of injury.
"That's the mystery for us - that it went in the warm-up, which is miles less intense than training.
"Something needs looking at because it wasn't as if we gambled on him and threw him in. He trained every day and he came in on his day off and did intense one-on-one training just so he was ready for the match.
"It was a big disappointment to us. It's a blow to us losing Meite. But we've still got three centre-halves and we'll pick two to go with and try and do what we do."
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