Have you ever noticed some other weak points in the Manchester City team, such as the ones that have been enjoyed by the Manchester City team without Haaland? If Haaland is absent from the Manchester City team's squad, they lose by the biggest margin, the current defenders of the Manchester City team are quite hardworking but need more experienced players.
But the attack department is not that effective. So the defenders and the coach and the attack department of the Manchester City team need to be more careful. If every player in the whole team is experienced, then they will be able to perform more advantageously this season.
I don't think Manchester City will lose heavily if Haaland is not in the pitch. While he is a key player, Manchester City's system under Pep Guardiola doesn't rely on a single individual. They have enough quality in their squad to dominate possession and create chances even without him. In the attacking department Pep needs to bring in players who can add depth and quality. With aging players like KDB, Bernado Silva, and Gundogan. City should be planning for the future. Investing in creative midfielders and versatile attackers will help maintain their dominance and ensure squad depth.
Additionally finding a solid back up for haaland is crucial. While Omar marsmoush is an option, having another striker could help them maintain squad rotation and prevent fatigue during long campaigns.