“Defour will have an operation after seeing a specialist, it’s a real blow,” Dyche said. “It’s come out of the blue, he’d been playing on and felt a soreness in his knee, he played with it for a few weeks.
“We took him for a scan, one of those ones you probably wish you wouldn’t have, and it showed something that needs doing, it’s a bit of cartilage. That’s the way it goes.
“Unfortunately he’s going to be out for some time … the specialist will have to sort it out and we’ll wait and see what he says after the operation.”
Defour, however, said in a post on Instagram that the injury would rule him out for the rest of the season.
“Hard to take this one,” he said.
“Really gutted I can’t end the season in the way I wanted it. Promise to come back stronger for the new season.”