PSG does not have a squad capable of competing against the teams in the European Champions League. Let's look at the teams that PSG has played against:
1 - Girona (PSG won, but only scored 1 goal)
But Girona is a weak team in La Liga, it is not a team that fights for the title, it is true that last season Girona were in the good places in the La Liga table, but that was only last season
2 - Arsenal (PSG lost that game and they failed to score at least 1 goal)
We all know that Arsenal is a very strong team, but even so PSG is the Ligue 1 champion and has a lot of money, they should be able to beat Arsenal, but since they have a weak squad, they lost easily
3 - PSV (PSG draw and only scored 1 goal)
PSV is a strong team, but from a league much lower than Ligue 1, and does not have the same money as PSG. but even so PSG didn't win
4 - Atletico Madrid (PSG lost and only managed to score 1 goal)
We all know that Atletico Madrid doesn't compete for the La Liga title and they are inconsistent, PSG with all the money they have, if they had a good squad they would have won that game