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Yes, it is true. We cannot deny that Real Madrid can survive as a big team in La Liga because they have strong defenders and Midfielders. If Ramos and Marcelo leave the team, also Modric to be sold then, it is a big problem for Real Madrid. As a team, a strong striker will be nothing if they have weak defenders and midfielders. I think it is better to sell other players who mostly spend their time on the bench. For example Jovic, Vázquez, Díaz, or Fernández.
Big problem if Ramos, Modric left Real Madrid in this season because best defender and midfielder gone and make Real Madrid have looking complicated player and need more time like Hazard could be the same vision with Real Madrid playing, I know Real Madrid look close with David Alaba Bayern Munich defender but I think Ramos should stay at Real Madrid two season later and give more trophy because right now he was legend for Real Madrid