I can see because of the good performance from Xabi Alonso, he is now getting more famous and some teams are playing to hire this coach for the next season even if they are currently working with great coaches in their team.
For example, Real Madrid is still trying to find a replacement for Carlo Ancelotti because they know he is going to leave the team one day. But because of the performance we saw from Xabi Alonso, I don't think if Leverkusen let him leave anytime soon.
Of course, Xabi Alonso has become a target for coaches for top European teams because he has succeeded in bringing Leverkusen to the peak of glory since last season and with his strategy or tactics with Leverkusen, interest from European teams has certainly increased. It is still a mystery where his coaching career will go in the future and of course I feel that Real Madrid will probably be his new place. It is certain that Ancelotti will soon leave Real Madrid and of course this will be an opportunity for Xabi Alonso to return to his former club when he was a player. However, it is still unclear whether he still wants to target a title first for Leverkusen before he decides to leave.