There is no need for PSG to make big changes in their squad. Luis Enrique's system and the current players are already more than okay for a back-to-back.

Recently if you have noticed, the only team managed to beat them out of a tournament is Chelsea. I would love to see them facing each other in the Champions League this time...
And of course I can't overlook the fact that English teams in general made difficulties for them last season.
Yes, Chelsea was the team who stopped PSG from winning the tournament, but they also lost to Botafogo in the group stage, despite some people believed that it was a fixed game, PSG they knew would not lose if the match was important to them. PSG may still win the Champions League back to back with the previous squad, but it seems that they still want to strengthen their squad after the defeat against Chelsea, as they just signed two new players.
However, Luis Enrique understands how to manage his club, and I'm sure they will need more players for the upcoming season. After the pressure of last season, most of their important players may not be at the same level since they need more time to relax and return to their best form. Chelsea is another team that we cannot write off in the Champions League this season, I believe they have the strength to win it.