Napoli president Aurelio de Laurentiis has called on Dries Mertens to sign a new contract.

Turning 30 next month, his contract is due to expire in June 2018 and Manchester United are the favourites if he decides to leave.

“I hope that he will sign a renewal, but above all I hope he does it for his own good," De Laurentiis told Mediaset Premium after the Press conference to announce a Lorenzo Insigne extension to 2022.

“I hope Mertens doesn't go overboard and that his wife can be convinced that Naples is a beautiful city where you can live very happily.

“We have been in constant contact with his lawyers and discussing the matter for 10 days. I hope that as soon as possible the sun can emerge, because Naples cannot stay without sun.

“It would be better if this sun were called Mertens, a fairly unique player in the way he interprets roles, but above all a good lad. I am pleased to have him here in our squad."