PSG's job won't be easy in a tough group like Group F indeed. Newcastle, Dortmund and Milan are all challenging opponents for the current PSG. Because there isn't an impressive team play by PSG these days. They are expecting Mbappe to do most of the work. This can't help them be successful much in the Champions League.
This isn't the Ligue 1 in the end. PSG can find a way to maintain their title streak there but their job is very difficult in the Champions League. Mostly the team with the best team play win this title. We all saw what Manchester City did last season in the semi finals and finale even without Haaland's scoring or making an assist.
Group F is said to be the toughest group in this year's champions league. Newcastle, psv, psg and dortmund are all equally strong teams. If PSG's internal squad changes did not happen, PSG could have kept the team ahead. But now these four teams are almost of the same quality. And every team has a tendency to qualify for the knockout rounds . However PSG coach Luis Enrique is very experienced. Although PSG did not perform well in Ligue 1 in the first two matches, their performance is quite good now . There has been stability in their performances and the bonding between the players is excellent. With luis enrique's brilliant match strategy, psg have a high chance of qualifying for the knockout rounds. The newcastle team's performance has now become erratic. Also they are not experienced enough on the Champions League platform.
You called it wrong where PSV is not in F and they are in Group A. Group F is filled with PSG, Dortmund, Ac Milan and Newcastle United which makes Group F have the tightest level compared to other groups. I think these 4 teams have different strengths in the depth of their squad and their lack of consistency in the first match will make it difficult for them to compete closely to get through the group stage.
Be it PSG or AC Milan, they have to try hard to beat their opponents in the first match. PSG has a squad that has had quite a lot of changes in this transfer window so it will be quite difficult to predict their game in the Champions League this season.