The Premier League minnows, who are near certain for relegation, are worried about losing a key forward.
This week, Wilder has outlined his belief that the club have a good chance of tying down striker Daniel Jebbison to a new contract.
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Asked about Jebbison's contract talks with the Blades, Wilder said: "In talks with the chief exec at the moment, so we're all positive. We had a Zoom meeting with the owners and the board and Steve (Bettis, chief executive) last week. So it's ongoing.
"We're confident and hopeful, the attitude of the boy and the parents and the agent is that he sees his future at Sheffield United. And we replicate those feelings, so fingers crossed we can get down and we can be sensible with everything and we can get another bright young player signed."