I am happy that you know that injury can play a major role on the life of a player and a club in their performance. This is why it might be impossible for Man City to win it again next season even with the same players. We saw how injury crippled Man united performance and some other good clubs performance,which made it impossible for them to achieve their goal. Man City was very lucky,that they didnt suffer from injury this season which made the club and players stronger. So let's stop thinking that next season will be the same as this season. Changes is constant,who on earth will believe that Chelsea will perform poorly this season. It is hard to look into the future but we can also think that it is possible for things to remain the way that they are.
I pay enough attention to the strategy that is usually used by Pep Guardiola in every team he coaches, he always tries hard to encourage every player as much as possible to avoid incidents that could potentially become injured and that has proven effective because in the season that has passed, we have not seen the man city player seriously injured (different from other arsenal squad or EPL team)
In order to cover for injuries, every team needs to have good first and second-eleven players. Being an intelligent manager, Pep Guardiola does not always start his starting eleven in every game for Manchester City, and this has been producing positive results for him. He alternated the first and second eleven players in minor matches, but he always fields his strongest squads in tough matches. This is what put an end to Arsenal's hopes of winning the Premier League. Their starting eleven players meant everything to them. They fall short of winning the league because they don't have a suitable replacement for their starting eleven players when injuries come knocking at their door.