Manchester United have confirmed that Johan Guadagno, Dillon Hoogewerf and Mateo Mejia have joined the club.
The Red Devils also confirmed that the club have signed a new contract extension with Paul Woolston and Luca Ercolani.
Man United made this known in a statement on the club's official website on Sunday.
The statement read: "Manchester United is pleased to confirm new deals for Academy players in the Under-23s and Under-18s.
"Two members of Neil Wood's squad, Paul Woolston and Luca Ercolani, have signed fresh contracts to continue their development with the Under-23s.
"Woolston, a goalkeeper formerly with Newcastle United, appeared in the final two Premier League 2 matches of last season, while centre-back Ercolani has been at the club since 2016. United Under-23s keeper Paul Woolston. Former Newcastle keeper Paul Woolston has signed a new contract.
"At Under-18 level, international clearance has now been received for three new additions.
"Johan Guadagno is a 16-year-old keeper from IF Brommapojkarna in Sweden, while forwards Dillon Hoogewerf and Mateo Mejia have also joined.
"Netherlands Under-16 international striker Hoogewerf arrives from Ajax and Mejia was previously with Real Zaragoza in Spain."