PSG's squad may not have any big-name star players. But the bonding between the players in PSG's squad is very strong. So if the players of PSG can continue this kind of performance then there is a possibility of this team performing well in the Champions League as well. Due to the good understanding between the players, the team played well in all three matches in Ligue 1 and managed to win each match by a big margin. PSG got an experienced coach like Luis Enrique. Luis Enrique is also an experienced coach for the Champions League platform. So I think PSG has a great chance to do well in Champions League matches this season.
Having big names isn't necessary all the time to get the team winning any game, because even with big name at some point, a team has lost still so it's mainly the tactical reference and strategy of a team that gets them to doing as better as they really can, only a few still make it really big with big names, some actually do fail and some times the big names in the team ends up not shining bright because of the environment typically but a better one for them helps them get the magic done for them.
Having many star players in a team sometimes does not always have a good impact, the proof is when PSG still has several star players such as Kylian Mbappe, Neymar Jr, Lionel Messi and Sergio Ramos but they still can't realize their dream of winning the Champions League title they are only able to win the domestic title when they have spent a lot of money so the presence of star players is not something that can be proud of by the club if the club cannot maximize its performance, precisely with high solidarity and good cooperation even without star players the club can perform as well as possible because they have the motivation to work together to realize their dreams not be selfish to be able to get individual titles only.