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Being a coach of a big team always carries pressure, especially when it comes to Real Madrid, where the team as a whole is always ambitious to win the championship. Without patience from management and fans, Xabi Alonso won't be able to make major changes in a short time, as it takes time to adapt. Xabi Alonso may not have much coaching experience, but managing Leverkusen with a limited squad is a huge success.
At Real Madrid he has a number of good players, and a little touch will make it easier for him to develop the team. But it takes time to find a good strategy format so there are several options that can be applied if the previous strategy does not work well.
The high demands from management and fans who want to always win trophies make coaches always under pressure, at least Alonso has experienced pressure after he failed to lead Real Madrid to win the Club World Cup trophy. His arrival at Real Madrid was also a result of Ancelotti inability to win the title last season, even though if you look deeper, Real Madrid failure was not entirely Ancelotti fault because he had previously asked the management to bring in new players after several key players suffered injuries.
It's impossible for Xabi Alonso to make major changes in a short time even though Real Madrid has managed to bring in several top players because next season will face more challenges in La Liga and the UCL.