Emerson, who had a difficult time at Real before returning to Italy last summer, said: "He must think carefully, because I've had the chance to play for many teams and so I know what it means having to change.
"Here he is already a legend, so I say, why leave Milan?
"We know that if he changes, he must start again from scratch. He must think carefully and must make the right choice.
"Playing with him is a great pleasure, he is a player that helps you win. He is an element that makes the difference.''