Koulibaly: Napoli have always believed in Scudetto

Kalidou Koulibaly ignites Serie A title race as Napoli beat Juventus

Kalidou Koulibaly ignites Serie A title race as Napoli beat Juventus

Headers from Sergej Milinkovic-Savic and Stefan de Vrij put Lazio 2-0 up at halftime before Serie A's leading scorer Ciro Immobile added two in the last five minutes to take his tally to 29 goals and Lazio's to 83.

And tests on Monday confirmed a tear to the biceps femoris, the club revealing the 33-year-old has already begun receiving treatment for the issue.

In the last four matches, Massimiliano Allegri-coached Juventus must go up against Inter Milan and Roma, while Napoli, coached by Maurizio Sarri, will have an easier schedule, facing the likes of Fiorentina, Torino, Sampdoria and Crotone.

"We knew it was a very hard and important match, but we did everything to win, we did it and can be proud of ourselves", said 26-year-old Koulibaly.

The match was a nail-biter, with Napoli nearly notching an early goal when winger Lorenzo Insigne fired a shot that went wide.

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Juventus had to reshuffle their defence after Giorgio Chiellini limped off injured in the 11th minute although they almost went ahead with a Miralem Pjanic free kick which was deflected on to the post.

Juve looked satisfied to play out a goalless draw at home to the Partenopei, a result that would have preserved their four-point advantage at the top with four rounds of the league season remaining.

"It's enormously satisfying, but we have to be clear-headed enough to see it as one match and realise it changes very little in the wider scheme of things". We'll do all we can but it all depends on them. So it will be a really tough game, as it always is, and we need to start thinking about how we'll go about it. We weren't as sharp as usual.

Inter are a point further back in fifth, just outside the Champions League places, after a hard-fought 2-1 win over Chievo.