Chris Wilder's reign as Blades boss is underway and he's made his first changes off the field.
Joining him and assistant manager Alan Knill at Bramall Lane will be Northampton Town's Head of Sports Science Matt Prestridge.
Chris commented: "Matt has been outstanding for me, in terms of number of days players train; statistically, we had a fantastic record last season at Northampton and although there are always going to be injuries, we need to keep the players as fit as possible, motivated and ready for action.
"Alan, Matt and myself work very closely as a team but it's not insular, all the staff have a part to play.
"It's about the football club getting the results we need every Saturday and Tuesday. The staff have a part to play, it is a group effort, not just about the 11 that go out on to the pitch."
Meanwhile, Head of Recruitment Lee Turnbull and Strength and Conditioning Coach Lee McMahon will both leave the club.
Chris added: "We wish Lee and Lee well with their careers, it is part of the restructuring plan going forward."
* Alan Knill, Chris Wilder and Matt Prestridge