Blades sweat on Jam

Blackman’s situation compounded a disappointing evening for United, who were knocked off top spot in the Championship after a 1-0 defeat to Ian Holloway’s men and also lost George Baldock to injury.

Although the right-back’s withdrawal was later explained as a tight hamstring, Blackman’s injury appeared more serious as he collided with Cameron Carter-Vickers and dropped the ball after falling awkwardly, allowing Idrissa Sylla an early tap in.

The on-loan Chelsea goalkeeper was taken to hospital after leaving the pitch on a stretcher, and Wilder admitted: “We’ve not had the best of nights in term of injury. We had to change the shape around when I thought we were having a decent period of the game.

“We’ll do the necessary scans on both players.

“Blackman’s looked a really awkward fall. I don’t know where it’s going to be until we get the results from the experts.”

Blackman was replaced by Simon Moore, making his first appearance of the season after sustaining a knee injury in pre-season. United, who dropped to third, face Hull City at Bramall Lane on Saturday.