United's planning for the 2018/19 campaign is underway.
As is traditional at this time of the year, the retained/released lists will shortly be submitted to the EFL.
It shows Clayton Donaldson will be released following a short spell with the club. The striker scored five goals, including two on his debut, in 26 league appearances since signing from Birmingham City.
Chris Hussey, who spent the duration of the 2017/18 season on-loan at Swindon Town, having made just 11 appearances for the Blades in League One, will leave the club.
In addition, the following players, who remain under contract, will be made available for transfer or loan: George Long, Ben Heneghan, Louis Reed, Nathan Thomas, Samir Carruthers, Caolan Lavery and James Hanson.