The 22-year-old has recently been strongly linked with the likes of Chelsea, Real Madrid and Barcelona.
Zamparini has revealed that Palermo have received an offer of €50million for the highly-rated midfielder.
“The possibility that he (Pastore) stays next year is 10 per cent,” he said in Corriere dello Sport.
“He is now in Argentina, calm and preparing for the Copa America. His agent is evaluating three or four offers.
“I can confirm that yesterday an offer of 50million euros arrived from a foreign club.
“The player has no preference regarding his destination. For me he is worth more than 50million euros because in two or three seasons’ time, his price will be double.”
Pastore’s current contract at Palermo is set to expire in the summer of 2015.