Guardiola will not face any problems for Oleksandr Zinchenko, if he leaves the team. Because Oleksandr Zinchenko is not an important player for Manchester City. But I think Guardiola should strengthen his defense. While he brought in talented players like Haaland to strengthen the forwards, he did not do enough to strengthen the defense. Manchester City needs an experienced defender now.
Am surprised you did rate the Ukrainian International Oleksandr Zinchenko down this way. I consider him one of the best talents in the Manchester City squad. Let's face the fact, his got skill, speed and some shot power to support. Last season was a very hard time for him, with the on going war in his nation with Russia and the distress it would put him in, his sure not to be in his best but, his by far one of the best talents in Manchester City. Perhaps this is some deal to stimulate Arsenal to release Saka for them.
Let's not forget, R. Sterling and G. Jesus have left the team on transfer so, the options isn't as before and this could mean trouble for the bench.
Manchester City is full of great players right now and it does feel like Manchester City does not need Oleksandr Zinchenko at this moment. But I don't deny that he has got skills. His skills are really good. But that is not something that Manchester City needs right now. And if he plays for any other team he will be able to get a lot more play time compared to what he got at Manchester City.
-.-
I don't understand why he says Zinchnko is a very important player in Manchester City. I don't really understand how he measured his importance. Someone that is not a first team player cannot be that important to a club.
Saying why Guardiola is more interested in his attack than the defence could be his pattern of play. He believes that if he can score 4 - 5 goals evey match, it will be difficult for the opposition to equalize such goals. Besides while playing any club, Manchester City always has the larger possession. So Manchester City is not a defensive club.
He is a good player. Maybe he will also be a very important player in any other team but not in Manchester City right now. Because Manchester City has a lot of better players compared to him. It's all about the necessity and he is not needed in the City at this moment. But I am sure he will be a valuable asset for other teams. And I also think that Manchester City is going to play aggressive football in the next season because that's how they are shaping the time right now.
-.-
Guardiola works very well with the squad, he has the opportunity to have several equal players in each position in the team, so yes, the departure of Zinchenko from the team will not be a big problem for Manchester City, but the departure of a player of this level will still be noticeable. In the end, there are no irreplaceable players, everyone can eventually be replaced, especially since this will not be a problem for a team with such financial capabilities as City.
I believe that Manchester City has a really good score right now and the main squad which they have is really good. But even the main squad of Manchester City can be easily rotated. So I don't think they will have to worry too much about a certain player leaving the club. Manchester City is going to play aggressive football in the upcoming season and they have the perfect squad for that in my opinion.