The Turkish giants are reportedly ready to offer 12m for the Swiss international midfielder.
"I do not know who is circulating this baseless rumour," agent Dino Lamberti told calciomercato.it on Monday. "I have never talked to these people.
"Gokhan is happy in Naples, even more so now because the President is planning to carry on ahead with this great project.
"Gokhan has already spoken with new Coach Rafael Benitez who has said he wants to focus on him.
"Both myself and the player have a great relationship with President Aurelio De Laurentiis, so there's really no reason to think about leaving Napoli.
"After all, I've gone to Napoli and presented them with offers from other Italian clubs but they didn't even want to consider them.
"In order to leave Napoli, the Azzurri will have to send him away "