"As for Pato, he is an amazing player. He is very young though, only 18-years-old," Kaka told BBC Sport.
"He has an incredible future ahead of him and he can do a lot of things with Milan. He needs to be allowed to grow and to improve without too much pressure on him."
Of his own future, Kaka declared: "I am very happy here in Milan but if one day I had to leave I would like to play in another big European team.
"The biggest clubs are in Italy, England and Spain so it would be in one of these countries, although it is clear they play differently in these places.
"I can compare Spain to Brazil as they play a similar type of game, the way the players play.
"The leagues are very similar in the sense that all the teams play very tactically and it is very difficult to score goals.
"I think these three championships are the most important in the world at the present moment, all very good and competitive."