He should be able to achieve this again, now that he's coaching a big club with a much better quality of players than he had at Leverkusen. The typical difficulty for a coach is not having quality players, making it very difficult for them to achieve success. But Xabi Alonso is at a team that has everything, and it should be much easier to achieve success, although the challenges are also much greater. I also believe Xabi Alonso will be successful at Real Madrid, but not in his first season because competing in the Champions League is different from competing in the domestic league.
Xabi Alonso now has one of the best squads in the world. Every player in this squad is very talented. And that's why Xabi's tasks are also very arduous.
The Leverkusen team was not very strong. We do not see any star players in Leverkusen. On the other hand , Real Madrid has a lot of star players in their squad. And it's difficult to control so many star players. Also, a big club like Real Madrid will definitely play to secure both the Champions League and La Liga titles. Xabi Alonso has never faced such a big challenge in the past. So I think the chances of him succeeding in his first season are a little low. But Xabi Alonso is very talented. He will do his best to secure the La Liga title this season.