Ahead of Saturday's trip to Somerset, boss Danny Wilson says he has been impressed by the contribution of David McAllister.
The Irishman scored United's first League One goal of the campaign within minutes of the kick-off in the opener against Shrewsbury Town, a club he represented on a temporary basis last term.
Wilson revealed the Shrews enquired about taking the midfielder back to the Greenhous Meadow this summer, but the Blades boss was keen to see what McAllister could offer United, a decision that now appears to have been vindicated.
Speaking of McAllister's impact and what he has offered, Wilson commented: "David has done very well this season.
"The loan spell at Shrewsbury last season did him the world of good. They wanted to take him on-loan again this summer, but we refused the offer because we needed to have a look at him in our team and owing to circumstances, it has been very fortunate that we have been able to call on his services.
"In football terms, David is still very much a young lad, but he will make better decisions the more games he plays and playing alongside better players will only aid his performances.
"He has a terrific engine and in the absence of Michael (Doyle) he has been required to play central, although we have seen the threat he can offer off the flank.
"He is brave and can nick the odd goal, he has a terrific shot, so in many respects he has been a bonus to us this season. When everybody is fit he will remain in a strong position to be selected because he has produced some good displays already."