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PSG's performance was great last season. However, it will be so unfair for them if they want to change their manager. That will be a wrong move for them. The manager has tried for them. They won their first Champions League through his management, and that is enough for them to even give him more time to continue managing the squad. I think he will still do more better at PSG.
although the coming season will be more difficult than last season because many clubs are preparing for the next coming season. Let's see how PSG will look like by next season. They are used to dominating the league in the middle of the season, which I always consider luck, but since next season will be tough from what we have seen, let's see if PSG can be able to do the same thing.
Some managers decide to leave after a spectacular season they have given their team. Enrique is not known for that kind of thing - so I think he will stay with PSG for a few more seasons even if the team is not as good as last season in terms of achievements. Enrique has given everything for his team at the moment - he is good and capable, but he can never guarantee the same thing every season.
Next season will be very difficult for Enrique especially considering he has never had back-to-back Champions League wins. PSG will certainly try hard to maintain their performance next season - but I really don't think they will be as strong as last season. Even if they can - I think they will only defend their domestic title instead of the Champions League.