I know that most clubs are still strengthening their squad but that doesn't mean that they wouldn't be able to pick form in no time. Next season will be a big challenge for PSG in the Champions League.
Paris Saint-Germain would face a lot of challenges next season in the Champions League. The Champions League will be very competitive next season because many clubs are trying to strengthen their squads, and if they do strengthen their respective squads, there would be a lot more competition in the league than that of last season.
The competition would make it hard for PSG to continue their form in the league; challenges would keep showing up for many clubs next season, and the league would be unpredictable and very hard for small clubs who don’t have much experience in the league. The Champions League next season would really be interesting to watch.
Of course, it won't be easy for PSG to face the challenge of the Champions League next season. Besides the many changes made to strengthen their squads, any team that wins the Champions League trophy last season will usually struggle to defend it the following season. Even Luis Enrique has acknowledged this, as defending a trophy is more difficult than winning one.
But this doesn't apply to the French League. Even before the season started, I bet on PSG to win the Ligue 1 trophy again next season. PSG's strength is indeed unbeatable in domestic leagues; they are simply too superior, and I don't see any other team capable of competing closely with PSG.