I feel like that is not really a realistic expectation that City would have any trouble at all. I do agree that when you are playing away, I mean like when you are playing at Copenhagen, that might be a big trouble during the winter but looks like it may not be all that cold weather period neither, not sure we have to wait and see. However, when the game comes to Etihad, I think it is going to be as easy as it could get.
I don't care if they put all 10 players on defense, City is getting through that defense one way or another, they have done it to much better teams and they will do it to Copenhagen as well. City is just unreal level of talented team and they are going to end up winning, KDB might even return, and I think they can win even without him.
I think the away match for the first leg will not be a big problem for Manchester City because with the strength they have of course they can beat Copenhagen. On the other hand, for Copenhagen, the first leg will be a good moment for them to win because if Copenhagen fails in the first leg, it will automatically be quite difficult for them to win in the second leg. For now, both teams can use their free time to develop better strategies before this match starts. But I think Manchester City will not think of this match as the big pressure they will face because Pep knows the best way for the team when the game is almost close to starting.
Meanwhile Kevin De Bruyne will re-join the squad which will certainly be a strong addition to Manchester City. Well, maybe we have to wait for the line-up of players from both teams because if Manchester City goes down with a perfect squad, of course they will be able to perform better and become the favorite team to win this match.