Chris Wilder has added an England youth international from Manchester City to his squad ahead of Saturday's Championship curtain-raiser against Swansea City.
Kean Bryan has become United's fifth summer addition, putting pen-to-paper on a three-year deal at Bramall Lane. He arrives on a free transfer, although the Premier League champions have a sell-on clause on any future transfer fee.
Manchester-born Bryan began his career with City at the age of 11 and went on to captain the club's development squad.
Comfortable in defence or midfield, the England youth international offers versatility and enjoyed his first taste of senior football with Bury during the 2016/17 campaign. Last term, the 21-year-old furthered his development away from the Etihad Stadium, making 32 appearances in League One with Oldham Athletic, scoring twice, with his form enough to see him win the club's Young Player of the Year award.
Blades boss Chris Wilder sees potential and versatility in his newest recruit. He remarked: "We watched Kean throughout last season and he's got a great pedigree with England and Manchester City.
"It's a fantastic deal for us, Kean is naturally left-footed, he can play left centre-half, left-back and in midfield and he is a very good technical player we think we can develop.
"He played over 30 games at Oldham which will have aided his development and it's important that we've kept the squad balanced with permanent signings and loans."