England Under-19 international defender Jamaal Lascelles has signed a four-year contract at Nottingham Forest.
The highly-rated centre-half, 18, signed his first professional deal with Forest in 2011 and made his debut against Burnley in January.
Chairman Omar Al-Hasawi told the club website: "We're great believers in the development of exciting young talent and Jamaal fits into that category.
"He feels his best hope of continuing to grow and develop is by staying."
Lascelles, who played nine games during a three-month loan spell with Stevenage last season, has been capped at England Under-18 level and Under-19 level.