"I've met with a range of clubs, including Juventus," the Brazilian said at a press conference in which he was unveiled in his new role at Milan.
FIFA World Cup 2018: Portugal striker Andre Silva says 'there are no favourites' ahead of clash against Morocco
Silva came on as a late substitute in Portugal's 3-3 draw against Spain in their opening game in Group B, while a late own goal condemned Morocco to a heartbreaking 1-0 defeat by Iran.
La Liga: Luka Modric's thigh injury makes him latest player to join list of injured Real Madrid players
A statement on Real Madrid's website said Modric "has been diagnosed with a muscle injury in the biceps femoris of the right leg."
Portugal have failed to beat Spain in seven previous meetings at major tournaments, including as the Spanish team went on to lift their only World Cup in South Africa in 2010.