The 21-year-old opted to commit his future to the Premier League outfit until 2020, and will be spending another season on loan. Last campaign, Henderson made 48 appearances whilst loaned out to Shrewsbury Town.
Sheffield United manager Chris Wilder told the club website: ''This is a big one for us, as Dean was certainly a target for rival clubs in our division.
June 18, 2018
''It is a position you've got to get right in terms of not only ability, but character too and we have no doubt following chats between myself, Dean and Darren [Ward], that we've got both.''
Wilder added: ''Dean is a confident boy, who has proved himself wherever he has been. He is positive and most importantly a winner and he will handle the pressure of coming here.''