Palermo president Maurizio Zamparini has set Javier Pastore's asking price.
Zamparini revealed this week he has already rejected a recent offer from Chelsea for the Argentina international.
“Pastore could leave, but the starting price for negotiations is €50m," said Zamparini.
"He is one of the few world class players who are left in Italy.”
Chelsea's offer is understood to have been for €33 million.