Every match played in the Champions League is of course not an easy match for all clubs, including Manchester City who are currently trying to defend the Champions League title this season, indeed, we cannot doubt that the squad that Manchester City has is far above Copenhagen, but still we also cannot rule out the surprise factor that  from Copenhagen might provide in the second leg even though it is unlikely to happen.

So far, Manchester City has a 3-1 aggregate advantage over Copenhagen,Apart from that, they also get the advantage of playing at the Etihad Stadium in the second leg, but apart from all that, of course Pep Guardiola will not try to risk  lose the victory that is in sight by underestimating Copenhagen later, currently tight schedules are certainly starting to hit european teams and it is very likely that Pep Guardiola will rotate players a little in that the match.
Currently Manchester City main focus is of course on their closest match, namely against Manchester United in the league, so it is certain that Guardiola will field their main players when facing Manchester United later and give rest to some of the main players in the match against Copenhagen and that is why I say If Guardiola will do a little player rotation in the second leg to maintain the stamina of their main players in facing a tight match schedule.