Unnamed club has made offer for playmaker
But he was reluctant to disclose who had made the bid as both Real Madrid and Barcelona continue to be linked with the star attacker.
Speaking to Radio Kiss Kiss, Zamparini said: "Pastore? I expect him to get back to his best levels. I already have a request for €50m for him but I have not responded.
"Will he head to Napoli? If I was Aurelio De Laurentiis, I wouldn't buy him at that price."
The Sicilians welcome AC Milan at the weekend off the back of a five-game losing streak.
"I have told the players not to play with pressure when we take on Milan, just like Bari did last week," he said.