Nigel Clough says ensuring several key players are fit, should United make the end of season play-offs, is already in the back of the minds of the Blades management team.
Speaking prior to Saturday's clash at Leyton Orient, where United need a point to make certain of a top six finish or for Rochdale to fail to beat automatic promotion hopefuls MK Dons, Clough revealed that both Ryan Flynn (hamstring) and Matt Done (groin) are likely to be sidelined for the immediate future.
He commented: "Flynny is certainly a major doubt for the weekend. He has been struggling with his groin for few weeks now, but hopefully if he receives the treatment now he should be available for Chesterfield and beyond.
"The priority is getting our play-off spot guaranteed, but at the same time we have to do a balancing act in keeping people fit for the play-offs in the belief we will get there with a positive result on Saturday.
"We need the likes of Flynny and Matty available for what would potential be three very, very big games next month, the same applies with the likes of Jay McEveley, who is still nursing a shoulder problem.
"The problem is that if we risk one, we could lose that person for a matter of weeks and they won't be available for the play-offs."
Meanwhile, the Gaffer admitted Terry Kennedy's season hangs in the balance, Clough remarked:
"Tel is seeing a specialist in London on Friday, so we'll know more then, but we already know Terry has got an 'old' knee for his age and we have done well to get him out there at times this season.
"We know the state of his knee, we have looked after him and nursed him through it at times, but when he has got out there he has performed very well. At the same time it is a troublesome area of his body and we appreciate we have to be very careful with his workload.
"Terry is worth having around because he is very committed and dependable, but he is only a young man and he has to consider his long-term welfare."
One positive ahead of the weekend, is the possible return of left-back Bob Harris, Clough concluded by saying he could feature against the O's:
"Bob is scheduled to train on Friday having completed a lot of work behind the scenes in recent weeks on a one-to-one basis. If he comes through that he will travel with us.
"We haven't had the settled team anywhere near as much as we would have liked, especially defensively, and that is something that we want to rectify in the summer."