Blades boss Nigel Adkins has made a double striker swoop.
sufc.co.uk can announce that the paperwork has been completed on the signings of Billy Sharp and Conor Sammon.
Sharp signs after an undisclosed fee with Leeds United was agreed and Sammon arrives on a season-long loan from Derby County. Both strikers could feature in Chris Morgan's testimonial fixture on Sunday after training with their new team-mates on Saturday.
"Delighted to get both players over the line and I'm looking forward to working with them," said boss Adkins. "Billy is someone I know well and Conor is a player we have admired from afar and have monitored his progress since he was at Kilmarnock."
Sharp, 29, a self-confessed Blades fan, began his career at Bramall Lane and has enjoyed spells at Scunthorpe United, Doncaster Rovers, Southampton and Leeds, as well as loan deals at Rushden and Diamonds, Reading and Nottingham Forest.
Sharp, who has signed a two-year deal with the option for a third, has 140 goals to his credit in 290 league starts with his most productive spell coming at Scunthorpe, under the stewardship of Adkins.
Sammon, 28, has nine caps for the Republic of Ireland after being handed his senior debut by Giovanni Trapattoni in 2013.
His club career has taken in UCD and Derry City in his homeland, before moving on to Kilmarnock, Wigan Athletic and Derby County, who paid a seven figure sum for his services in 2012. He has since had loan spells at Ipswich Town and Rotherham United, for whom he scored important goals in maintaining their Championship status last season.