That's why I believe Manchester City won't lose much form even if they have to let Ilkay Gundogan go to Barcelona. Manchester City have plenty of quality players to replace Ilkay Gundogan in their squad, but Kovacic will also fill that role as expected. We still don't know how Manchester City will form next season, but they won't change much.
Some of the players brought in during the transfer market will make them even stronger, that includes defense as well as midfield. I also think that Manchester City will build a better squad and will add some important players in the middle of next season. So far their huge investment has paid off, but they can't afford to let more players leave without someone to replace them.
Yeah for Manchester City's performance, there is no question, they still use the same squad, strategy and formation not much has changed but will Manchester City dominate the Premier League again? well of course we can't be sure because so far their competitors such as Arsenal, Newcastle and Manchester United have used different squads meaning that their strength is different from the previous season. So far Manchester United have brought in 2 great players and still eyeing a 3rd player like Rasmus Højlund from Atlanta even though they only brought in 3 new players their strength could change because these 3 players will occupy important positions Goalkeepers, midfielders and attackers.
It's the same with Arsenal which has brought in 3 players Kai Havertz in attack line, Declan Rice and Jurrien Timber on defense. This step is considered appropriate because Arsenal's record of conceding goals was quite bad last season their defense is weaker than Newcastle and Manchester City so it's no wonder they strengthened the defense line. Arsenal have spent €231 million so far on these 3 players. There is a possibility that Arsenal will bring in another new player, rumors are that Mohammed Kudus is still in their sights possibly to replace Granit Xhaka.