The Brazilian defender, who moved from the Rossoneri to Paris Saint-Germain this summer, believes his countryman will depart from San Siro soon.
"I don't think Robinho is as happy as he was during his first year at Milan," the 28-year-old told Sky Sport Italia.
"He always has an immense desire to win and do well, but I think he might leave in January.
"For what I know, Pato is not happy. He wants to go back to Brazil. I do not like to see him down like this."