Pep has no best line up, and impossible to push them to play beyond their limit, though it's mandatory to qualify for the UCL play-off. City's basically having winning mentality, but due to the lack of quality players in his squad, he confused bout how to rotated his players.
He missed his best line up, which is affecting the quality of his team's gameplay. According to the odds, City is being favored, but it doesn't rule out PSG's chance to win the competition.
An away game for his team is gonna be the big burden to his club. I'm not hoping a lot from his club, winning with narrow score shall be enough.
It'll be disappointing if his club bottled the game against PSG.
I don't think there is a lack of quality players in Manchester City squad. Pep Guardiola has built one of the most expensive squads in the world. And I believe that they have the best squad together with Real Madrid right now. They are full of star players. If you mean the injury period of some important names then I would agree of course. The absence of players like Rodri affected their efficiency negatively so far.

I have heard of only Omar Marmoush as a transfer rumour and he is expected to join them soon. Other than him I don't think Guardiola will make many big signings this month.
The reality is that Manchester City still have a good line-up but indeed, the losing streak that Manchester City are on is like something that suggests that their era may be over. Also, I personally think Manchester City not have a squad with a winning mentality if it were not for Pep Guardiola and thus, Pep Guardiola is a very important coach for Manchester City who also managed to form a winning mentality for the Manchester City squad.
So, I personally believe that as long as Pep Guardiola is still at Manchester City, the chance to get good results will always be there even though indeed, failure is very likely to occur because of course it is not easy to maintain good performance from season to season, because teams like Real Madrid also experienced several times of decline and failure.