I have some doubts about Man City after looking at their transfer market, a lot of key players have been let go like Mahrez recently joining the Saudi Pro League. For sure they need some time to get into top form after so many changes in their main squad.
City isn't the only team to experience changes after this summer's transfer market. This situation is experienced by almost all clubs, and all of them are also trying to bring in players and make their best squad back. like PSG also lost some of their main players.
we can see how the changes that will be shown by several clubs at the start of the season. City will still be a strong team, I'm sure of that. but the other teams will not be weakened either. club from Serie A may be the one who will make a lot of surprises in the Champions League this season.