Manchester United manager Erik ten Hag offered the number seven to Mason Mount during their discussions prior to his transfer.
Mount has become the 10th United player to receive the '7' since players were assigned fixed squad numbers in 1993.
Alejandro Garnacho had been under consideration to claim the number that Cristiano Ronaldo vacated in November and last week supporters were unable to purchase a new home shirt with 'Garnacho 49' printed on it.
