Xabi Alonso will have to maintain last season's performance if he wants to still be held in high regard in Bayer Leverkusen. Club management don't really give a damn about your past performance because they want current results. It will be difficult for Leverkusen to replicate the unbeaten run next season but they should at least make a mark in the UCL League next season.
Leverkusen's performance has been phenomenal this season. They don't have a squad with star players but they managed to get an unbeaten record in the domestic league and almost became the first team in history to win the invisible treble. And it will be very difficult to repeat the same results next season. Leverkusen's defeat to Atalanta in the UEL final has exposed the weaknesses of Leverkusen's current game. To be honest, Alonso's tactics are really great but it seems like the players can't implement them fully. Correct me if I'm wrong. At that time Leverkusen often used tactics by placing many players on one side so that the opponent was really under pressure. But then Atalanta used high press man-to-man marking which made Leverkusen lose in the UEL final.
Gian Piero Gasperini knows that Leverkusen does not have strong players one on one so this exposes Leverkusen's weaknesses. I think if Alonso manages to improve this aspect next season then Leverkusen might be able to shock Europe once again.
One good thing about Leverkusen is about the good performance they have in this team. In fact, Leverkusen was not in the situation to beat teams like Bayern Munich and even win the Bundesliga title and if I am not mistaken, Leverkusen won the Bundesliga title for the second time in their history which is a great step forward for them.
Leverkusen didn't even spend too much money like Bayern Munich but they mostly won the game because of the amazing teamwork they have in their team thanks to their coach.
Leverkusen was not in a position to beat Bayan Munich in the beginning of the season that's why this team was not that tough opponent to all the other teams but gradually when this team won one match after another everyone considered this team as a tough opponent. The biggest surprise from Leverkusen's side was that they went undefeated this season and won the league title in addition to beating Bayern Munich. The team that all the other teams did not have much plans for last season, now the big teams will plan the most with this team. Bayern Munich will certainly not want to lose the league title to this team at least this season. If Leverkusen does not want to lose the title to Bayan Munich again, Bayan Munich will have to play well from the start and not drop any points in any match to win the league title next season.