Teenage midfielder Louis Reed has committed his long-term future to the Blades by signing his first professional contract with the Club.
The 17-year-old, who last season became United's youngest ever league player when he made his debut against Rotherham United at Bramall Lane, has penned a three-year deal at S2.
Louis has impressed manager Nigel Clough and his backroom staff in pre-season and was rewarded with a first senior start in Red and White against Bristol City at the weekend.
On his new contract, Louis remarked: "I am obviously delighted to have been given this fantastic opportunity by the Club and the Gaffer and I am determined to make the most of it.
"I have worked really hard throughout pre-season and the Gaffer stuck to his word that he would pick the team based on performances in the friendlies and in training.
"What I must do now is continue to keep my head down and work hard because I still have a long way to go - there is a lot of good competition for places within the squad."
Boss Clough commented: "It is incredible that he has only just turned 17, he has had a terrific pre-season and is progressing really well. We will look after Louis but he will be in and around the first-team, he looks a very good prospect.
"Of course, he is another to learn his trade in our Academy and tremendous credit must go to everyone associated with helping him get this far."