It is likely that Manchester City will add players. because some of its main players such as Erling Haland, Kevin De Bruine are injured.
With the tight schedule of the premiere league and champion league and the tight competition if you don't add players, you will be out of shape.
Both in the English league and the champions league can lose all their titles or cannot defend their titles.
Isn't De Bruyne warming up on their last match? According to some reports I've read, only three key players are injured for now: Haaland, Stones, and Doku. Some reports stated that Haaland and Doku can return as early as mid-January, while Stones has a more serious injury. If that is true, buying new players is probably not the best choice. Maybe they can loan some players if they really need to add more depth because I doubt any good player is fine being a third-choice just to get sold next season even for a team as big as City.