The 23-year-old, who scored his first national team goal against Guatemala, has made an impressive start in Italy with his club, Fiorentina.
"He is a boy who has everything, but unfortunately I will never sign him," said Dad, Diego.
"I never want to say never, but it's very difficult to have your kid in the dressing room, both for him and for the relationship.
"If in five or six years he becomes a more important figure than he is, we'll talk about another situation.
"Maybe the day that I'm not at Atletico Madrid, he will be able to go."