The reason for PSG they spend lots of money but they can't get anything in the champions league is mostly because they didn't have a good manager and they just bought superstar players while PSG didn't have a balanced team, this situation made chaos in PSG that's why they players couldn't have a good atmosphere in the team to have good performance.
PSG is one of the best clubs in the world, they play well in their league, but when they play in the Champions League, their performance is very poor, the coach doesn't have the skills for playing in the Champions League, they need to change the coach if they want to perform well next season, I see there are several new players already since Messi left the team, I would prefer Zidane to coach them, he was one of the best coaches when he coached Real Madrid, and he won the Champions League
If he can coach PSG, he will know which players to buy to help the team win the Champions League.