The Serie A side have confirmed their interest in signing Manchester United midfielder Marouane Fellaini
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Napoli president Aurelio De Laurentiis says his club has joined in the race to sign Barcelona midfielder Javier Mascherano.
Mascherano has been strongly linked with a return to the Premier League, with his former club Liverpool, Arsenal and Manchester United reportedly keen to acquire the 29-year-old's services.
Coppa Italia winners Napoli guaranteed themselves the third and final Champions League qualifying spot in Serie A on Tuesday with a comfortable 3-0 triumph over 10-man Cagliari.
Dries Mertens put Napoli ahead from the penalty spot in the 33rd minute before Goran Pandev made it 2-0 before half-time.
Cagliari had goalkeeper Marco Silvestri sent off for a red card in the 54th minute after he brought down Pandev inside the area.
Marek Hamsik saw the resulting penalty denied by the crossbar before Blerim Dzemaili put the game beyond Cagliari's reach in the 57th minute.