It is likely that it will have a considerable impact on Napoli performance in the next season after the change of coach has taken place. Rudi Garcia will reap many obstacles because Napoli is the defending champion next season so he must be able to bring better progress to Napoli next season. Even Napoli has not been very active in this transfer window even though if you look at it they also have to make changes in their squad to be stronger next season.
Most likely Napoli's performance will be much different from the previous season and it depends on how Rudi Garcia tries to take advantage of the current condition of the players. Not being active in the transfer market and not signing some of the players they need will also have an impact because for next season there will be no new players who are able to complement players who did not develop in the previous season.
Rudi Carcia, who was previously sacked by Al Nassr, but he became the choice for Napoli management to replace Luciano Spalletti. I think Napoli game might change because it was triggered by the tactics of their new coach. For Osimhen, he is still a pretty aggressive sticker in Serie A for now. I think if he stays with Napoli for next season then it is very likely that Rudi Carcia will get full strength to bring Napoli back to win the Scudetto.
The dismissal of Rudi Carcia by Al Nassr's management was definitely triggered by the coach's performance which was unable to have a positive impact on the club, thus triggering distrust from the management to continue his coaching next season. Rudi Carcia will find it difficult to handle Napoli because of the burden as defending champion and the demands of the fans are so big, Rudi Carcia needs adaptation to maximize his players and I think it will take time for him next season.
Because it is not easy to be involved in a coaching transition that previously managed to bring the club to the better. The arrival of Rudi Garcia raises a lot of doubts because before that Spalletti managed to lead Napoli out as champions and now the responsibility is shifted to him next season.