A new slimline version of the Brazilian is expected this season after experts at the MilanLab identified a medical condition was hampering the striker's weight loss.
Berlusconi said: "I have made my compliments to him because he is training very well, with a lot of seriousness and commitment. He has had this medical condition since he was young, but now he will give a great contribution to Milan when he returns.
"When Alexandre Pato also arrives, we will see two beautiful players."