PSG spent a lot of money and signed several star players. Even then their performance was not good. Even though the Ligue 1 teams are not very strong, the PSG team cannot perform well. Even PSG spent a lot of money to win the Champions League title. But their performance in the Champions League was worse. Even though they have a lot of money, PSG management can buy star players even if Messi and Neymar leave the team. We will see a lot of star players in PSG's squad next season as well. However, Ligue 1 is not very competitive. And I think the Newcastle team is much stronger than PSG right now. Because the Premier League is very competitive. The standards of Ligue 1 teams are much lower than Premier League teams.
In last few years, PSG spend huge funds for the win of Champions League, but sadly they have never been spent money for having good combination of winning players which is more important instead of having many stars to win any cup because this is never been ideal to win just because of having star players.
They need to work on their structure which helps them for having few players which give them good backup and also having good mentality for staying positive for any competition in French Ligue 1 they have no good team which give them challenge, so they are able to have better result in Champions League.
Now they are losing all stars and having no way to go with Zidane is not interested to join them as coach with this now their best choice is Mourinho which is also well experienced coach and can bring better results, but they need to work on long term instead of after spending huge funds on star players for win the big title.