The striker is enjoying a revival in form this season.
"We agree on everything, there should be no problems. We're at details," the representative told Radio Crc. “The renewal is proof that the situation is changing, and there's a willingness on both sides to continue together.
“We spoke with more than one club, also Italian, over the summer, but we're proud of De Laurentiis' proposal because things are going in the best possible way.
“Manolo never wanted to leave the club and be the defeated party, especially after the departure of Higuain.
“He wants to be a protagonist for this Napoli team that fights in both the League and Champions League. When you play for a great team, it's obvious to have other options.
“Clauses? They've always been lucky at Napoli, but we wanted to establish a long-term relationship with the club, of five years.
“With a clause, only one valuation is given to the player on the market, and at this time it wouldn't allow both parties to work serenely."