After Gundogan left, this does not mean that Manchester City's strength immediately underwent changes that made it difficult for the defending champions to maintain their performance this season. His departure cannot be a setback in the Manchester City squad, there are still other players who can replace Gundogan's role very well.
Pep Guardiola is not too bothered by Gundogan's departure, he will continue to do his best so that Manchester City can defend the title this season. The squad this season is still very solid, Manchester City is still considered the favorite team in this competition. Currently Guardiola is focusing on the opponents his team will face, Real Madrid will carry out a mission of revenge in this match. If they succeed in beating Real Madrid like they did last season, there is a big possibility that Manchester City will win this prestigious trophy again.
Gundogan became an important pillar for Manchester City when they won every title in the league or Champions League so far, but Manchester City is still Manchester City who are not dependent on one individual player in the squad, at this time I think Manchester City are no longer sad when they lose Gundogan, because after all there are some players who can indeed continue to give their best performance in helping Manchester City to victory, Manchester City are now in a tough competition in the league, FA and Champions League so Guardiola must be able to rotate his squad well for now.
Against Madrid, it will definitely be a difficult game for Manchester City, I think the game against Madrid will be a test for Guardiola to continue to maintain their consistency, besides that the draw from Arsenal in the league certainly benefits Madrid and I think at the moment Madrid may have pocketed the gap from Manchester City weakness, making it possible for Ancelotti to exploit that weakness to get the victory as well as revenge for their failure last season.