Napoli president Aurelio De Laurentiis has set the asking price for Edinson Cavani.
Manchester City and Chelsea are keen on the Uruguay international.
De Laurentiis told Gazzetta.it: "Last summer I was offered 55million euros (approximately £45million) to release him but I didn't sell.
"Then in September we fixed his release clause. All things considered, buying him would cost 63million euros (approximately £52million)."