Nigel Clough has a number of injury concerns as the Blades boss prepares his players for three games in five days, starting with a Championship test against local opposition.
Ryan Flynn, James Wallace and Jamal Campbell-Ryce will all sit out Tuesday's clash with Huddersfield Town (7.45pm KO) with niggling injuries, although Flynn and Campbell-Ryce are expected to feature against Turkish champions Fenerbahçe on Thursday.
Meanwhile, Wallace continues to work tirelessly with United's medical staff at Shirecliffe, with Clough optimistic about getting his summer recruit from Tranmere Rovers some match action before the Blades kick-off the league campaign against Bristol City on 9th August.
The Gaffer remarked: "Jamal twisted his ankle on Friday night and that has swelled up quite a bit. He will miss Tuesday, as will Flynny, but hopefully both should be fine for Thursday's fixture.
"James is progressing nicely and we want to get him right for the weekend at York. Hopefully we can get 15-20 minutes into his legs on Saturday if everything goes well."
Looking ahead to the prospect of two games in three days, Clough continued: "It was nice to be at 'home' again on Friday night and in the next few days we are simply looking for further small improvements as we continue to look ahead to the first day of the season.
"The aim from now on will be to get more lads through 90 minutes. Huddersfield will be a good test for us, it will be different from Friday and then Fenerbahçe will be another different challenge, but that is what pre-season is about.
"We obviously would like to win both matches, but we are looking for much more from these games than simply the result."