The newly promoted Blades have already made one signing of the season in the form of defender David Sommeil on a free transfer, also from Manchester City.
Danny Mills: Blades Bound?
Mills, an experienced full-back has been told that he no longer features in Stuart Pearce's plans and can leave the club, it is expected that the former England international could cost £500,000.
I'm very disappointed the way things have turned out," Mills revealed. "I'm surprised because Stuart Pearce praised me before I got injured for the way I had been playing.
"But once I'd recovered I played just five games, despite our results - I don't think the manager liked me asking questions or making suggestions."