Nigel Clough says managing his squad is going to be important between now and the end of the season.
The Blades boss has had to cope without a number of key players in recent weeks and although that situation is now improving, Clough admits Mark Howard and Matt Done are just two players that need to be monitored in the coming weeks.
On Done, the Gaffer revealed: "Matt needed a rest in midweek and thankfully he got one, he was desperate for a breather. We also managed to get Marc McNulty some minutes in the second-half which he needed too.
"Matt has been struggling for a while but we have needed him. He has had problems with his calf muscles cramping up and he has been wincing when he has been sprinting, which isn't surprising given how hard he has worked all season.
"But we need to look after him now and make sure he is right for the run-in and beyond. It is pointless risking him when other lads are fit and raring to go."
Of his goalkeeper, Clough continued: "Mark's back seized up again after the weekend, but it isn't anything too serious, we probably won't risk him on Saturday but he should be fine for Barnsley.
"The summer is when he will sort it out properly, at this stage of the season it is about patching him up and hoping it doesn't go again.
"He actually twisted it when he nearly slide out of his penalty area on the far side against Port Vale."
Looking ahead, Clough concluded by revealing Stefan Scougall and Terry Kenendy took another step forward in their rehabilitation earlier this week and Jay McEveley is in contention for a recall to the squad.
He finished: "Jay's shoulder is there or thereabouts after some treatment and a break, whilst Scougall and Kennedy played 45 minutes each in a friendly on Wednesday and James Wallace and Michael Higdon aren't too far way either.
"When Louis Reed comes back from international duty we will have a squad of in excess of 20 players, with plenty of competition for places and cover."