Xabi Alonso achieved this record at a very young age (as a coach), it is very difficult for other coaches to lead his team to end the season without even losing in the domestic league. As a result of his expertise in building Leverkusen from a team that was never considered in the Bundesliga to a team that has a winning mentality, it has attracted interest from other clubs to bring him in.
It's time for young coaches to make achievements. Xabi Alonso is not alone as a coach at a relatively young age. In Serie A, there is Thiago Motta who made history with Cagliari. Even though the achievement is different from Alonso, who has never lost in 34 matches, Motta managed to get Cagliari to the Champions League.
He chose to stay in Leverkusen because he didn't want to just leave the project he had just built.
It didn't take long for Alonso to make Leverkusen a tough competitor for Bayern Munich, his cool hands have made Leverkusen create new history that has never been achieved before, he is also trying to make Leverkusen win its first Treble winner in the club's history.
Choosing to stay at BayArena is certainly the most appropriate decision in my opinion, although I hope that before the decision to stay with Bayer Leverkusen is made, they will be willing to go to Anfield to replace Jurgen Klopp.
Next season Alonso's challenge will be different to what he has done for Bayer Leverkusen this season. The most obvious challenge is that Alonso will likely be left behind by several important players this season because they will be eyed by other big clubs.
If that happens, Alonso will rebuild his squad next season so that the potential to defend the Bundesliga title will be difficult, especially in the competition with Bayern Munich.