Inter, who have yet to put a trio of wins together, welcome Rafael Benitez's third-placed Napoli on the back of wins against Sampdoria (4-0) and Parma (2-0).

However Inter, who sit in the last remaining Europa League spot in fifth and with a five-point lead on Parma with four games remaining, want to keep the momentum going.

Mazzarri remains at a loss to explain their lack of consistency, but admits things will have to improve if Inter are to overcome what he described as an "exceptional" Napoli side.

"I'm not a big fan of looking at the statistics... I just look at the way my players have trained in the week, how fit they look, in what sort of form we are," said Mazzarri.

"There's always something we can work on and put right. I don't think we are consistent enough during the 90 minutes, so that's what we need to work on.

"There's no doubt we can play better than we have been in our previous two games, when we've offered almost no resistance to the opposition for a quarter of an hour.

"We don't kill games off when we have the chance. That's happened a lot this season."

Turning his attention to Napoli, whom he steered to runner-up place behind Juventus last season before leaving for Inter, Mazzarri added: "They're an exceptional side, as their league position suggests.

"We'll have to play well, something we always try to do, and at the end see whether we've done well and achieve a positive result."

With Napoli 12 points ahead, Inter -- who did not play European football this season -- have virtually no chance of claiming the third and final Champions League spot.

Mazzarri said the remaining four games of the season will give him a chance to "make assessments and try to finish the season as high up the table as possible".

But he added: "If we look back at our results this year, we can safely say that we've picked up a lot fewer points than our performances have deserved.

"We need to make the jump in quality that will allow us to plan for upcoming seasons. That's basically the point of this season now."