I see that the performance of Manchester City players is quite even in all their lines and indeed they have proven that they do not experience a decline in performance when there is player rotation, the same goes for what will happen in the future, it is true that Kyle Walker is quite an influential player but that doesn't mean that if he is absent then the team's performance will decrease drastically.
Manchester City will face 2 difficult matches in the near future, against Arsenal and against Real Madrid and with the problems they are currently facing, many of their players are injured, even though it is difficult, I think Manchester City still has a big chance of getting through these difficult matches victory.
I believe Man City will soon overcome Walker position, his role is quite vital but cannot completely reduce Man City performance. Pep Guardiola can still cover this gap and balance will be maintained. Against Arsenal, you have to use the correct formation to be really strong, Arteta ambition is very big to try to surpass Pep Guardiola strategy and this time his meeting in fighting for points will definitely result in a heated situation on the field. Apart from that, Man City also needs to be alert because after fighting Arsenal, their players are required to maintain stability. 50:50 of the results of this match will have an impact on the next match, and if another injury occurs then Madrid will really benefit. Therefore, Haaland, De Bruyne and Foden need to play alertly.