Burnley striker Jon Walters has been ruled out for up to eight weeks after undergoing keyhole knee surgery.
The 34-year-old's latest injury setback effectively ends his chances of leaving Turf Moor during this transfer window, with Sunderland among the clubs reportedly interested in his services.
Walters has struggled to force his way into the Clarets side since his move from Stoke last summer but figured against both Manchester United and Manchester City in recent weeks.
Dyche said: "Jon Walters has had a minor tidy-up in his knee -- there's a very small split in his cartilage that was annoying him so the decision was made to get it tidied up.
"He [Walters] has had surgery. At his age he knows when it's right or wrong so we decided it was best to do it. The guidelines approximately six to eight weeks [out].''