Goalkeeper George Long will spend the 2017/18 campaign away from Bramall Lane, as he looks to play regular first-team football.
The 23-year-old, who made four appearances last season prior to Simon Moore's arrival, has joined Sky Bet League One side AFC Wimbledon on a season-long loan deal.
Speaking upon Long's departure, boss Chris Wilder remarked: "George's attitude last season was first-class, but we understand his need to play first-team football.
"He goes to an excellent club with an excellent manager, hopefully this loan will prove to be beneficial to all parties and George returns an even better goalkeeper."
Sheffield born and bred, George has made a total of 123 Blades appearances after progressing through the Academy.