PSG, who were defeated by Chelsea in the Club World Cup, will not immediately experience a setback when competing in the Champions League next season. PSG will also strive to win the Champions League trophy again, although it will be very difficult for PSG, as several other teams will also be doing the same next season. But generally speaking, PSG will not be immediately weakened just because of their defeat to Chelsea, although I also admit that Chelsea have indeed made quite positive changes recently.
Since PSG won the Champions League last season. And they did not make any changes in the squad. So it is expected that we will see a stable performance of PSG in the next season. PSG has an experienced coach like Luis Enrique. But Real Madrid, Chelsea, Liverpool and City have all tried to strengthen their squad. Also Barcelona and Munich are also very strong. So the road to win the Champions League again for PSG is very difficult. Even my guess is that PSG will not be able to win the Champions League next season. They may be able to qualify for the semi-finals.