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You have to be worried about PSG performance in Ligue1 also because they may be the best team in the league but if they start losing this early it will have a negative effect on the team and if they take the motivation to the champions league their opponents will have no fear when they play against them since they are not in good shape like they were last season that earned them the result of being the best time. Ther performance last season was much better than this season though it's still early to know when they will become by the end of the season but it you compare thei4 performance this season and last season it's obvious that last season is far better. They have to remain consistent in all competition if they wan to maintain the same energy of last season and not losing against any team in the chmpions league is what they must maintain.
You are forgetting something which is that , PSG started last season on a struggling Note especially in the champions League . Don't forget that PSG even played the playoffs in the champions League group stages, PSG may have lost last week game but don't think that they are not that good again this season PSG is still a threat to Europe they because it will take time before PSG can fully get back to full form.