Argentina midfielder Pastore, who turned 22 this week, has apparently attracted serious interest from a number of clubs around Europe this summer including Chelsea, Real Madrid and Barcelona.
However, with Udinese owner Gianpaolo Pozzo having revealed he expects to receive €50 million for Sanchez, Zamparini has now claimed that he expects even more for Pastore and will happily retain the player if his valuation is not met.
"Pastore is worth more than Sanchez," Zamparini told Corriere dello Sport. "He will one day win the Ballon d'Or award.
"I have not received any offers for Pastore but there have been approaches from foreign clubs, a few concrete, that are growing strong - but I reiterate that the player is worth €50 million and that price could be higher depending on the offers as well as how the battles between the teams that are interested in the player unfold.
"I don't think Italian teams will make it. For €38 million, Javier will not move. We are ready to extend his contract for a further two years and he would be happy."
Pastore is under contract at Palermo until 2015.