United boss Sir Alex Ferguson sees Nani as the long-term replacement for Ryan Giggs.
The 20-year-old has been dubbed the new Cristiano Ronaldo in Portugal. Nani is sharing the same agent as Ronaldo in Jorge Mendes.
Nani said: “I’ll only leave Portugal to play for a club like United. The Premiership is spectacular and to be the next Cristiano would be a dream for me.”