There is still an exception to this; they did incredibly well this season, earning them the champions league trophy, and no team presently holds their record in football history as far as the previously concluded season is concerned. But we can't be certain of what other teams' performance will be like next season in comparison to Manchester City's. While speculating, we may give Manchester City full confidence in winning the trophy again next season, but in reality, we need to observe how other clubs perform when the next season begins to determine who will win the title in the end.
Why you look at the squad of Manchester City, they possess the most squad dept of any club in the Europe.
And from recent seasons, Manchester City has always been winning the UEFA best team of the year, even when they are unable to win the Champions League. This is the say that for almost three seasons, Manchester City has been the favourite team to win the Champions League, but they were unable to win it. So if they have been the favorites for like three seasons ago, there is no guarantee that they will not be the favourite in the coming season, especially when they are even going to reinforce the squad.