The 15-year-old has been signed for an undisclosed fee.
Portuguese newspaper O Jogo report that goalkeeper Joel Pereira has signed a new contract at Manchester United.
Lech Poznań defender Łukasz Bejger will have a trial at Manchester United this summer from July 31-August 5.
While confirmation is yet to come from Manchester United, photos show Aliou Traoré and Largie Ramazani signing contracts for the club in recent days.
Manchester United have confirmed the players offered scholarship deals by the club for next season, as Academy Man Utd previously reported.