The formalities have now been completed on Harry Maguire's transfer to Hull City.
United signed off the necessary paperwork on Wednesday lunchtime, allowing the defender to join the Premiership side.
Nigel Clough commented: "We are disappointed to lose a good player, Harry has given the Club three or four years of good service at senior level. But we move on, our aim now is to strengthen the squad in certain areas in the time we have available."
Maguire made his Blades debut in April 2011 and went on to make 166 appearances in all competitions, scoring 12 goals.