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Correct. It is what I also think about them. It is too risky if Real Madrid sells Ramos and one of their best midfielders. Ramos, Marcelo, and Modric are the key players, they are irreplaceable. I doubt Real Madrid will lose its power if those players leave Real Madrid. If Real Madrid wants to have a younger squad, it shouldn't directly sell all key players. It is very important to make sure the team won't lose the balance significantly.
I agree with you that Real Madrid should not lose all of their key players. Especially Sergio Ramos who is the true leader in the Real Madrid team,
because for me it was very different to play Madrid without Ramos. Even though Ramos was 34 years old, still his presence is indispensable.
Moreover, Madrid's defense lines usually play less discipline without Ramos. I think Real Madrid letting Sergio Ramos go would be a very bad decision.