Burnley skipper Steven Caldwell will be sidelined for the next six weeks after it was revealed that he has a torn thigh tendon.
Caldwell, 27, was forced to leave the field after just 10 minutes of last weekend's 3-2 loss against Southampton.
Boss Steve Cotterill told the club's website: "He will be rescanned in 10 days to see if he needs an operation.
"It's a blow because we've lost Michael Duff as well. We're without two defenders who'd both be first choice."