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I think Ancelotti still needs Luka Modric in his team that's why he is still keeping him in the team despite his age but for his physical condition Modric is very feet just that Ancelitti is building his team around younger players because they are the future of the club since the older players doesn't have the much time to spend in the club again. Modric may not have much playing time in Real Madrid again but his impert in the team can't be forgotten and when Real Madrid is having difficulty in the midfield Modric has always been introduced and he does wonders in the midfield when ever he is introduced in the game this alone will not let the Madrid coach to let him leave in a hurry.
For a player like Modric going to Saudi Arabia won't be a problem for his because he is a skilful player but it will be left for him to make the decision to either join the Saudi Arabian teams to make more money or to take a break from playing football.
But to be honest I think that slowly but surely Modric's time to retreat is coming. I love him as a player and I admire this guy for what he has achieved as a footballer who is not the typical world star in terms of his appearance, but he has his very own way to navigate his whole team through difficulties in a game and he was even able to score some fine goals,. It didn't happen very often, but I remember there were a few important goals he scored in his career. But his ability to read games and to navigate through messy games is quite unique. His game with the ball is insane and his positioning without the ball is insane too. He is available nonstop and everywhere to be found. Another great player who is soon going to say goodbye.