"His arrival in Paris was sudden, it was almost unexpected," he told TuttoNapoli.
"My son's intentions was to stay in Naples next season because he had one goal – to break Maradona's goalscoring record. The PSG turned up with an incredible offer, and we all know what football is like.
"Naples was Edi's second home, and I don't think he left the fans the way he wanted. I have no doubt, though, that he will soon send a message to the Neapolitans."
Cavani scored 104 goals in 138 appearances for Napoli after joining from Palermo in 2010.