The 22-year-old Ivory Coast international has shone this season with six goals and seven assists, including a late winner against Manchester City last month and an equaliser against Liverpool on Sunday.

“I am really proud to have signed this new contract,” Diallo said in a statement.

“I have had some incredible moments with this club already but there is so much more to come. I have huge ambitions in the game and I want to achieve history at Manchester United.”

United, who are 13th in the Premier League, travel to Arsenal for an FA Cup third-round tie on Sunday.