Neymar Jr is dormant player, still injured and have been sideline for months, not good for the club because they signed him from Paris Saint-Germain because he was the positioned player that would relieve pressure. Al Hilal don't depend on Neymar Jr for winning games and lifting trophies. They've in place, the expected squad to clean out the competitive race.
Al Hilal knew that the Brazilian player was injury-prone, yet they went ahead to sign him. It is assumed that the club had some other reasons for signing Neymar Jr. Publicity might be another major reason since the Saudi Professional League needed all the attention to compete with other major leagues. On the pitch, he has not contributed much; maybe his influence has brought some level of publicity to the league. Based on reports, Neymar might recover from his current knee injury by the end of this month. The club needs his skills and experience to continue its dominance of the Gulf League.
I don't think the current coach deserves to continue managing Al Nassr. It seems he can't make any improvement on the Al Nassr performance. Why Al Nassr doesn't try to hire a top European coach? There should be some European coaches who want to manage Al Nassr if Al Nassr wants to make an interesting offer. Al Ittihad already gives the example, they succeed to sign Laurent Blanc as a new coach. This attracts many European players to have an interest to join Al Ittihad.
Al Nassr already has an European coach. Luís Castro is a Portuguese and has managed big clubs in Europe, such as Shakhtar Donetsk and FC Porto, and also the Qatarian side Al-Duhail Sports Club. We shouldn't start criticizing him now since these games are just preparatory to the main league events.