Because Bayer Leverkusen managed to go undefeated last season and so, if the Bayer Leverkusen team still has the same manager and squad, then it is very possible that Bayer Leverkusen will still be able to get good results next season. Unless,if last season Bayer Leverkusen only had the luck to reach the final, then it is very possible that nextseason Bayer Leverkusen will experience a decline in performance. But indeed,any result is ofcourse still possible, but I personally am still very confident that Bayer Leverkusen still has the ability and a very big chance to get good results next season. Although indeed, having an unbeaten record is certainly difficult to repeat, but if only to get good results, I'm sure Xabi Alonso will still be able to do his best for Bayer Leverkusen next season.
Leverkusen has been able to give us an interesting spectacle so far, Leverkusen has certainly shown us how they are able to become champions and compete with the current big team just by relying on makeshift players without the support of star players, so far Leverkusen is a mediocre team that is able to rise and surprise all of us after they are coached by Alonso, Leverkusen's journey in the Europa League is certainly not as beautiful as their journey in winning the Bundesliga this season without defeat, next season Leverkusen will of course play in the Champions League and it will certainly be very interesting how they can maintain their form next season.
Next season will be a difficult challenge for Alonso in maintaining their performance, because after all the rival teams will strengthen their squad very well, so indeed Leverkusen is also required to do the same by bringing in some new players to be able to compete next season, I personally doubt a little if Leverkusen can repeat their glory next season because indeed tighter competition will occur both in the Champions League as well as domestic leagues.