If Manchester City also makes changes to their main squad, namely by recruiting new players in the back line, of course this could also make it difficult for opponents to move, especially if they meet Madrid in the UCL next season. If you look at the strength of Manchester City, they are still not strong enough in their defense. So there is still a lot that needs to be changed and Guardiola should be able to see that it is also important for the back line to be given additional new strength from new players who might be better than their current back line players.
Manchester City don't have to do many things, they only need to change the goalkeeper, that's all. All of Manchester City's defenders are strong, their problem might be find replacements for veteran player like Walker, but the quality doesn't have any problem.
Brazil didn't even include Ederson Moraes for Copa America, Pep should be aware with this because if Moraes is a good player, then why he didn't get selected? Dorival Junior choose Alisson and two goalkeepers who play on Brazil league over him.
I think it can't just be about improving the defense line because of course, the midfield and front line also need to be strengthened to get better results, of course. Even though it is true that Haaland is still very good for the results obtained in the Premier League, but the reality is that Haaland still cannot perform optimally when playing in the Champions League and several other important matches such as the final match played by Manchester City.
After all, if Haaland has stable performance in all matches and in all competitions, then of course it will be good for Manchester City. Because after all, I still think that Manchester City sometimes still get into deadlocks quite often and quite often Manchester City actually concedes first even though Manchester City have good ball possession. Therefore, I think Manchester City still has to strengthen its squad in every line so that it can score quick goals so that it has a good chance of winning every match.