I never think Leverkusen can match their unbeaten record next season, but everyone can expect logical things about them next season. Xabi Alonso has a big responsibility to maintain his team's performance, this is the most difficult challenge I imagine for him next season.
It is very difficult to maintain the success that has been achieved, every time a new season rolls around there will always be an increase in competition and different performances displayed. However, I still believe Leverkusen will be the toughest competitor for Bayern Munich and Dortmund next season because they still maintain the squad that has won trophies this season and will likely bring in new players to add to the team's strength. Xabi Alonso responsibilities will be even heavier next season because Leverkusen will play in the Champions League, the level of competition which is more competitive than the Europa League means that Leverkusen must perform optimally if they want to survive longer in this most prestigious competition.
Leverkusen have surprised everyone this season and won the league title with a brilliant performance. There were some stronger opponents in the German league but no team did well against them which is why they ended up going undefeated and securing the title. Their unbeaten run this season will undoubtedly give them confidence going into the season ahead. If they continue this form next season, it is possible to do well against the other strong teams, including Bayern Munich, and beat those teams.
A tough challenge is definitely waiting for the manager in the upcoming season. Hope the manager is ready and the manager's boys are also ready to do something great in the upcoming matches.