The Brazilian has been one of the big new stories this season.
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His agent, Edson Toninello, told Si Gonfia la Rete: "So far I haven't had any contact with them. He's very happy in Rotterdam, he's adapted very well and plays for a big club, but obviously every big offer will be analysed.
"Of course, it's (Napoli) a big club, it's going through a great moment and it has a lot of history.
"His market value depends on Feyenoord... He's a player who has increased his value in recent seasons."