Danny Wilson is confident Kevin McDonald will be available for the hectic festive period, despite sustaining an ankle injury at Carlisle United.
Wilson, though, rates his midfielder as 'very doubtful' for the weekend's clash against leaders Tranmere Rovers.
Speaking at his weekly press conference, the Blades boss commented: "Kevin is getting better each day, but remains very doubtful for the weekend.
"I don't know exactly how long we are looking at, but hopefully he will be fit for the Christmas fixtures at the latest.
"He hasn't trained at all during the week because the swelling of his ankle has been very prominent. Getting the swelling down has been essential to be able to access the injury itself.
"He is now undergoing treatment on the strained ligaments."