Napoli are eager to secure their three summer signings Walter Gargano, Ezequiel Lavezzi and Marek Hamsik to new contracts.
All three have been outstanding in their first seasons in Serie A and are attracting interest from bigger clubs in Italy and abroad.
Napoli president Aurelio De Laurentiis declared: "We won't sell them. We are here to strengthen Napoli, not weaken it."