Mazzarri insists now isn't the time to hold new contract talks.
"A contract renewal? Now is not the time," Mazzarri told La Gazzetta dello Sport.
"If the President were to offer it, then I would thank him, but I have already said that I need to further motivate the squad and put myself in the firing line, so it's only right that I wait. There will be the right time and place to discuss it towards the end of the season. Please, let us not talk about contracts any more.
"We have to hope Napoli are constantly improving. Now this club is a stable figure in the battle for the top places in Serie A. Our advantage over Milan and Inter is that we have a solid core of players and haven't changed that much in recent years."