Manchester city is in an unstable condition in this transfer window because they have to make a big effort in keeping their players from leaving in this transfer window. Previously, two of their core players had been recruited by other teams in this transfer window, such as Gundogan who was recruited by Barcelona and Mahrez who was bought by Al Ahli. So recently, news has emerged that Bernardo Silva has started to be linked with a number of big teams in Europe and that Kyle Walker has also been eyed by a big Bundesliga team.
I think Manchester city should be able to hold Bernardo Silva and Kyle Walker for next season because they had a big influence on Manchester City game last season. So Pep Guardiola has to watch out for that if he doesn't want to lose a lot of their star players in this season's transfer window.
Actually this is a challenge for a club that has reached the highest level when they have got all the titles so some players think that they need a new challenge in another league, generally those who think like this are the old players therefore it would be difficult to prevent them from leaving. For Manchester City it's not really a problem because they already got a replacement for Ilkay Gündogan he is Mateo Kovacic.