Kaka also declared he'd welcome the arrival at Real of Brazil teammate Douglas Maicon, the Inter Milan fullback.
He said: "I am very excited to work with him as he is an incredible coach. I am happy with his signing."
Kaka added: "I am not going to get into who I think Madrid should sign; that's up to the club president. However, the team that signs Maicon will do very well. He is one of the best players in the world and if he were to come to Madrid, I would be very happy."