The Argentina international is set to end his stay in Sicily this summer with Chelsea, Manchester City, Real Madrid and Barcelona all in the race to acquire the 21-year-old.
"Pastore will not leave for les than 50million euros," Zamparini said to Radio Radio TV. "If he leaves, it will be difficult for him to stay in Italy.
"I have requested that his agent (Marcelo) Simonian, who is being pursued by Chelsea, Real Madrid and Barcelona, collate the offers.
"Over the weekend we will meet to shed some light on the player's future."
Pastore joined Palermo in 2009 from Huracan for 19million euros and was the team's leading scorer in Serie A this season with 11 goals.
He is under contract with Palermo until June 2015.
Source: Team Talk
Source: Team Talk