Henderson has been in stellar form for the Blades yet again this season, having already impressed in the previous campaign as he helped Chris Wilder’s side gain promotion to the Premier League.
The 23-year-old has kept 10 clean sheets in England’s top tier since making the jump from the Championship and sees his side sit third in the charts for fewest goals conceded.
Wilder has previously tipped the shot-stopper to usurp Everton’s Jordan Pickford as the Three Lions’ main man, and Fleck has now thrown his hat into the ring regarding Henderson’s career trajectory.
“He’s been amazing and he’s still a young boy,” Fleck said in an interview with Sky Sports. “He’s kept clean sheets, made some massive saves for us, kept us in games at times. I’m sure he’s going to have a massive career ahead of him.
“He’ll quite openly tell you he wants to be Manchester United’s No.1 and England’s No.1 as quick as possible. I don’t think, personally, he’s too far away from that now.