Chris Wilder has secured the services of a Championship striker with Caolan Lavery arriving from across the city in a three year deal.
The Blades have paid Sheffield Wednesday an undisclosed fee for the striker, with Wilder confident the 23-year-old can add pace and goals to United's cause.
Wilder remarked: "Caolan is a player we have tracked for a while. He is hungry, aggressive and wants to run in behind, exactly the type of player we need. He has the potential to play his best football whilst with us."
Lavery started his youth career in Canada, playing for the Red Deer Renegades, prior to moving to Northern Ireland. Ahead of joining the Owls in the summer of 2012, he spent two years in Suffolk with Ipswich Town, rejecting a new deal at Portman Road.
During his time at Hillsborough, Lavery has enjoyed several prolific temporary spells away from S6, with Southend, Plymouth, Chesterfield and, last season, at Portsmouth.
Towards the end of 2015-16 campaign, the Northern Ireland U21s international scored against United's U21s in a 2-0 victory at Hillsborough.
Caolan will wear the number nine shirt at Bramall Lane and was introduced to the crowd ahead of Tuesday evening's Checkatrade Trophy encounter with Leicester City.
He is Wilder's 10th signing of the summer.