Back-to-back title is quite possible for Manchester City when we think about it on paper. Because technically they have one of the best squads in Europe now. And they are playing according to Guardiola's really solid system as well. However this task is still going to be quite difficult for them at the same time.
The reason why is that they have really challenging opponents such as Bayern Munich and Real Madrid. Manchester City won the title for the first time in their history previously. It would be really challenging to retain the title against these more experienced teams.

De Bruyne and Haaland are needed as a duo for Manchester City from now on to increase their chance.
Manchester City winning the Champions League trophy back-to-back this season is possible because Real Madrid and Bayern Munich are the real threats to Manchester City. Manchester City beat Real Madrid and Bayern Munich last season to reach the UEFA Champions League final, and Manchester City can still beat Real Madrid and Bayern Munich this season.
Never say never. Manchester city was among the strongest clubs in the UCL. We shall we feel worry about this. As long as city will not be facing or bayern munich and it will be possible for city to get the UCL again this season. The chance is pretty big since de bruyne was coming back again.
This is a good news for manchester city and yeah we shall not forget that if haaland will be back again next month. The chance for manchester city to take UCL this season becomes even bigger than before. Im quite happy by seeing fuardiola said this on his latest interview.
Im feeling very good to say manchester city will be winning UCL this season. There will be no club can prevent haaland and de bruyne once they will be playing together. Halaand was just winning his first UCL on the first season he played for manchester city.
There will be a lot of surprises to come soon. This is gonna be very interesting competition to watch. City was always lucky in getting easy team as its opponent. Copenhagen was nothing for manchester city. '
Im not doubting the chance of city to get UCL this season. The club is performing far better than before and i can't even wait haaland to comeback again soon. He was a disaster for the whole clubs in UCL.