United have tied down striker David McGoldrick, skipper Billy Sharp and vice-captain Oliver Norwood to new deals, but the likes of John Lundstram and Phil Jagielka will see their contracts expire on June 30.
"If they want to take up their reward for their performances, it’s up to them now. We will leave them out there and see what the response is from the players but agents seem to be the way of the world." The Blades were denied a goal due to a goalline technology error and Wilder said such mistakes need to be eliminated with the resources available to referees in the modern game.