MLS Commissioner Don Garber admits they expect the Swede to join Milan when his deal expires next month.
But Rossi told Gazzetta dello Sport: "I don't know if he is likely to return. He is a player who has had an outstanding career, but he cannot solve Milan's problems.
"They put a patch on a hole but the water comes from many others. He would not be an investment useful for the future but only for the next six months. So what's the benefit? Yes, he can give the team something, but Milan has many problems."