United boss Sir Alex Ferguson has had Dede scouted in recent weeks.
He told Globoesporte. "I was with Brazil and a reporter came to ask me if I would go to Juventus.
"I said I like the team, they are a great European club, but now my focus is totally on Vasco [da Gama]. Speculation doesn't bother me. I'm happy with some of the comparisons.
"They compared me with Rio Ferdinand, who is a great centre-back, but I am totally focused on Vasco."