Armstrong blow for Blades
Sheffield United defender Chris Armstrong faces a spell on the sidelines.
Sheffield United defender Chris Armstrong faces a spell on the sidelines as he requires a knee operation.Armstrong missed last weekend's win at Newcastle after his knee swelled up on the day of the game.
United sent Armstrong for scans on the injury and it has been decided to send him under the knife.
Blades boss Neil Warnock expects to be without the full back for up a month.
"Chris had a scan last night, and the surgeon decided to operate straightaway - although the extent of the damage won't be apparent until he takes a proper look inside the joint," Warnock told the club's official website.
"There remains the possibility that if it is just a piece of floating bone Chris could be out for only three weeks. If it turns out to be a cartilage problem, it will take six.
"It is unfortunate for Chris and us - as it is for Michael Tonge, who is out of action with damaged ankle ligaments at the same time.
"But I am confident that both will be back as quickly as possible challenging for places again."
