Napoli turned down the chance to sign Bartosz Salamon before his move to AC Milan.
The Pole, who can play in defence or in midfield, joined the Diavolo last month for around 4m from Serie B side Brescia.
"I offered Salamon to Napoli sporting director Riccardo Bigon, but he turned him down," agent Mino Raiola revealed.
"We have different opinions when it comes to players, but it is right that he does his job and I do mine."