Bob Harris is a Sheffield United player - the paperwork has been completed on a permanent deal from Blackpool.
Nigel Clough intimated on Friday afternoon that the Club were working on making the loan deal for Harris permanent and it has now been completed.
Defender Harris, 26, joins after United take over his contract from Blackpool with an option to extend for the 2014-15 season.
On Thursday it was confirmed that Tony McMahon had moved in the opposite direction - signing for Blackpool on a permanent basis.
Glasgow-born Harris made his Blades debut in Sunday's FA Cup tie against Fulham after initially signing on loan.