Palermo president Maurizio Zamparini is willing to sell Franco Vazquez this summer.
The midfielder has been called up by Italy coach Antonio Conte this week.
"His future depends on what offers arrive. Give me 20m and he can go," said Zamparini.
"Napoli? If [President] Aurelio [De Laurentiis] is willing to shell out 20m it can be done. Do you think I'm exaggerating?
"[Stevan] Jovetic was sold for the same amount, and to me there's no comparison between the two."