The World Player of the Year said: "I've played with him many times in the national team, I like him a lot. If he arrives at Milan, he will be welcome."
Asked about crocked teammate Ronaldo, Kaka added: "I see him with the desire to return, he has always been an example of strength and I think that this will get him over his current situation.
"For him to go to Flamengo could be a solution, it is the team of his heart and could be an opportunity to return to play. For me, certainly he will be back."