Danny Wilson could dip into the loan market when the loan window re-opens next week.
The Blades boss, who added Dave Kitson to the ranks last Friday, has admitted his efforts to bolster his squad with loan players failed, but insists the situation could be resolved shortly.
"We will have to wait and see what happens on the loan front," said Wilson.
"We were a little dissapointed that a couple of enquiries didn't come to fruition on deadline day, so we will look at the situation again in the next week or so."
United have just one loan player on the books, Manchester United's John Cofie has scored in successive games.