Rafael da Silva has signed a new four-year deal with Red Devils, until the 2015/16 season.
The 21-year-old Brazilian has been linked with the Manchester United since 2008.
Rafael made 18 appearances in last season in the Community Shield, Carling Cup, Barclays Premier League, Europa League and FA Cup.
Rafael said, “I am so happy to sign a new contract. I love playing for Manchester United, there is a great team spirit here and a real desire to win.”