People think Xabi Alonso is the only reason for Leverkusen to get good results and that's totally wrong, Xabi Alonso is definitely a good coach, and he had an effective plan since he started working on this team.
Maybe without Xabi Alonso, they could never get the results they got so far during this season but the fact about Leverkusen is about the teamwork and I think just like Xabi Alonso in this team, other players and coaches had the same share of their success.
Successful teamwork is implemented because the coach can properly instruct every strategy used in the match, and Xabi Alonso did it well at Bayer Leverkusen, but what is often a curiosity is what will happen to Bayer Leverkusen if Xabi Alonso really leaves this team to join as coach of Real Madrid, and also sometimes without Xabi Alonso leaving Bayer, the team that appeared surprisingly will weak in the following season, as happened with Union Berlin and also Newcastle in the English premier league, especially if Bayer would release its core players because some of them, Of course, it will be the target of elite clubs who are willing to buy at high prices to buy these players which would be financially profitable for Bayer.