Here’s some of the stars who the Blades could take with them to the English top tier...
1. Joe Lolley - Nottingham Forest
Forest failed to impress last season, but Lolley’s performances were consistently exceptional. At the age of 26, the versatile midfielder is in his prime. (Photo by Tony Marshall/Getty Images)
Photo: Tony Marshall
2. Luke Ayling - Leeds United
Leeds will take a while to get over that play-off semi-final loss to Derby County, and they could well lose a couple of players. Ayling would strengthen the Blade’s backline significantly.
Photo: Stephen Pond
3. SWANSEA, WALES - FEBRUARY 17: Oliver McBurnie of Swansea City during the FA Cup Fifth Round match between Swansea and Brentford at the Liberty Stadium on February 17, 2019 in Swansea, United Kingdom. (Photo by Harry Trump/Getty Images)
The Scotland international smashed home 22 goals last season, and at the age of 22, he’s got bags of potential for the future. He's probably off to Brighton, mind.
Photo: Harry Trump
4. Reece James - Wigan Athletic
The Blues will be keen for their young defender to continue his progression next season, and United could offer him some valuable first team experience in the top tier.
Photo: Nathan Stirk