The bad news for Manchester City is about center-back John Stones, it seems this player is not in a good situation he can't play for the team for a long time.
John Stones got injured in the game they had in the Champions League against Young Boys and he could continue the match.
Manchester City is going to have hard games against teams like Leipzig, Liverpool, Tottenham, and Chelsea and they can't have this player which can make everything harder for Pep Guardiola.