Defenders Marc Jurado and Alvaro Fernandez Carreras have joined the club’s Academy from Barcelona and Real Madrid respectively.
Fernandez Carreras is a 17-year-old full-back who has mainly operated on the left side for Real Madrid’s Juvenil C team.
Jurado, 16, played in Barcelona’s Cadet A side before completing his move to Manchester.
United can also confirm the signing of Isak Hansen-Aaroen, subject to international clearance. The midfielder, who arrives from Tromso IL, made his professional debut for the OBOS-ligaen side in July.
Jurado and Fernandez Carreras have both travelled to Manchester from Spain and have followed the government’s self-isolation guidance since arriving.