David Brooks has committed his long-term future to the Blades, by signing a new and improved four-year deal.
The 20-year-old, who has impressed for the Blades this season and recently earned his first senior international call-up with Wales, is now contracted to United until the summer of 2021.
Having impressed during the summer at the Toulon Tournament, the attacking midfielder caught the eye in pre-season, scoring winning goals against Chesterfield and Stoke City.
Then, after making his first league start against Norwich City last month, Brooks produced a man of the match performance in the Steel City derby success at Hillsborough and impressed again as United beat Wolves at Bramall Lane a few days later.
Speaking following the confirmation of Brooks putting pen-to-paper on Tuesday, boss Chris Wilder remarked: "I'm delighted that David has yet again extended his contract - he's been rewarded for an excellent start to the season.
"David sees his future at Sheffield United and that's what we want to hear because, without doubt, he is one of the hottest properties outside the top-flight."