Napoli was relieved after Zambo Anguissa scored the dying miunute goal. Napoli celebrated that goal as if it was the finals that they succeeded in winning. It was a tough match for Napoli because their visitors sealed up their defense. I expect Napoli to improve their performance in the next match so that, they can easily win the match instead of struggling all through 90 minutes.
Napoli know that defending their Scudetto is hard and the other clubs in Serie A won't give Napoli any free Scudetto without challenge. Dropping any points will be harmful for their title defending task and Napoli have many reasons to celebrate that winning goal as 2 more points from it can contribute considerably to Scudetto competition in this season.
With Conte management since the last season, Napoli aimed at winning matches in whatever ways and results as most as they can. Earned points are more important than how they play and how many goals they score or how impressive or not impressive in their winning.
Napoli were lucky enough to break the deadlock in 95 minute to take all three points against Cagliari, all thanks to Anguissa, who gave Napoli a late win. It seems the absence of Lukaku in the Napoli squad is really affecting them badly because if Lukaku were available for Napoli in this match, there's no way Napoli could have struggled to defeat Cagliari. Napoli should be quick in signing Rasmus Hojlund on loan, or they will be behind Inter Milan in the race for the Scudetto this season.
Losing Lukaku in most months of this season is a very big loss for Napoli and Conte will have to change his initial plan for Napoli in this season. He must try different ways to motivate other players making more shots and taking advantage of any chance to try scoring goals for Napoli. If he can get 5 or 10 more goals from other players, Napoli will be able to cover this long absence of Lukaku and this increases their chance of defending Scudetto.