The 23-year-old has impressed for United this season, following the departure of Cristiano Ronaldo last summer.
United boss Sir Alex Ferguson told his club’s official website: “Nani is an emerging talent within the team and has developed tremendously since joining the club.
“We are delighted he has signed a new contract and I am sure he will have a long and successful future here at Manchester United.”
Nani said: “I am delighted to have signed a new contract. It has been like a dream come true to play for Manchester United.
“The coaching staff have taught me so much about the game and I’m playing alongside some of the best players in the world. I’m looking forward to winning many more trophies with this team.”
