Calzona currently serves as Slovakia and Napoli coach, with the club deal running to the end of the season.
Rossi told Teleclubitalia: "I think that the possibility of a double role is something possible, I have my doubts when the championship is of a high level like the Italian one, so it is possible to do it like Calzona did for a few months but no more, a double role is more possible if you coach a national team and some clubs involved in some less competitive league."
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Asked about the Napoli job, he added: "I see (Vincenzo) Italiano as a good fit for the Napoli bench.
"I often read in the newspapers that Italiano's name is being linked to the Napoli bench for next season, and I think it would be a good choice."