Chris Wilder says he is disappointed to be without influential midfielder John Fleck for the foreseeable future.
But the Blades boss has backed his player following the red card he was given for a foul on Korey Smith in last Friday's cruel loss to Bristol City at Bramall Lane.
Reflecting on Fleck's dismissal, Wilder commented: "We've a couple of options, we could move a couple of players round or bring someone in.
"I stick with my thought that if the referee produces a yellow card, nobody reacts any differently, we're disappointed to lose a quality player for three matches, but these things happen.
"It shouldn't be a case of someone getting sent off for making a tackle just because someone else got injured, or something should have happened at Burton.
"John is an important part of the group, but we'll battle on and John will overcome the disappointment of missing the next three games."
The manager added: "We've not got a big squad compared to some of our rivals, we've got a tight group rather than a bloated one and people will have to dig in and do a job for the team.
"I don't think John should have been sent off and my opinion has been backed up by several people including members of the opposition bench, but it's happened and we move on."