Lavezzi left Napoli for Paris last summer.
"To be honest, I don't know what will happen with Mazzarri," Lavezzi told Sky Sport Italia.
"He will certainly have reasons to stay or to go. It is something that goes through only his head and only he will know the real reason behind the eventual decision.
"It'd be a shame if he did leave, because I think he built today's Napoli side."