In view of the next transfer period, Napoli have six players whose current deals expire at the end of the current season.
Goalkeepers Roberto Colombo and Morgan De Sanctis would be allowed to open talks with other teams if they are not offered new deals.
Thirty-seven-year-old Colombo has no starts, while 35-year-old De Sanctis has 16.
In defence the Partenopei have not extended the contract of 34-year-old Salvatore Aronica who has played in five matches this term, 32-year-old Argentine Hugo Campagnaro, who has 13 appearances to his name this season, 35-year-old Gianluca Grava, and 29-year-old Leandro Rinaudo.
