Garrone admits the prospect is unlikely.
"Sampdoria fans always ask me in the street why Cassano isn't coming back, but I have to reply Cassano is happy where he is and we have to look ahead," Garrone Jr told Sky Sport Italia.
"Will he return next year? Anything can happen in life and I don't feel like ruling anything out.
"He loves this city and set down roots here, got married and had a son, so sooner or later I'm sure he will return regardless of whether it's with Sampdoria or not.
"However, Cassano is not part of our project, at least for now."