Bayer Leverkusen will struggle to make things standing next season because every oppositions they face will likely play their best against Leverkusen. Remember Bayer Leverkusen have one of the current best manager in the European world of football, Xabi Alonso the man that won the Bundesliga title unbeaten and have also dwell more of his valuable time on the squad for the purpose of preparation next season.
It won't be that difficult for Xabi Alonso to improve the depth of his squad again next season because Xabi Alonso only needs to polish several areas in certain lines so that his squad can have better strength next season, such as in the defense area and also the attack area. If Xabi Alonso is able to bring Leverkusen to win the Bundesliga without time, of course it is not impossible for him to repeat this next season as long as the players are still quite united and can still carry out Xabi Alonso's instructions.