The progress that has occurred while Xabi has been at Leverkusen has indeed made a lot of progress at the club. And this season is their best season in performance, in fact their performance is almost perfect. Currently, Leverkusen can be said to be a club that is very on fire and can also make changes in the Bundesliga over the dominance of Bayern. Yes, although we still don't know whether Bayern Munich will soon take over Leverkusen or not. because unfortunately, there are rumors that Xabi and Real Madrid have reached a personal agreement. but whether this will come true or not. If so, then of course this will have a big influence on Leverkusen.
It seems that everything is just a rumor that is not yet clear because there has been no official statement from Xabi or Madrid. But if they have agreed, of course Xabi must give the best results. At least Xabi can give good memories with the Bundesliga champions.
I think Leverkusen will also immediately look for other coaching options to prepare if Xabi leaves. Because they also don't want to keep Xabi. There is no clause of any agreement, but it seems that Leverkusen supports Xabi to develop. Leverkusen will provide a clear door and discussion if Xabi moves.
indeed this is just a temporary rumor but it could happen in the next season but what is certain is that Xabi wants to stay until Leverkusen is able to get the title he wants so that when Xabi goes to Real Madrid Leverkusen will have success without feeling disappointed when the coach leaves him because Leverkusen can be as strong as this because they received support from Xabi and got the right strategy, even Leverkusen was almost able to break dominance of this bundesliga giant thanks to Xabi, who currently has very good intelligence.
of course, before losing this best coach, Leverkusen will look for new coach early before Xabi leaves and I am still a little unsure Leverkusen will let Xabi go because in several seasons Xabi has been the best coach.