Kenny joined the Blades initially on loan in the summer of 2002 and after a three month loan spell was snapped up for a figure believed to be £42,500.
Paddy Kenny: Blades number one keeper.
Since then the Republic of Ireland keeper has attracted much interest from other clubs during the 91 games he has notched up.
However, if the Blades are content on promotion United may have to turn down much needed cash in order to succeed.