Change head coach unfortunately will change the games of Bayern Leverkusen for next season regarding tactician under Xabi Alonso era will difference tactician from Erik ten Hag. Bayern Leverkusen have good side after defending several main players last season and only sell few players only although Erik ten Hag must find right replacement for several position leaving by Jonathan Tah, Florian Wirtz and Jeremie Frimpong.
Amazing success two seasons ago is really hard to repeat especially with a club that does not win titles regularly like Bayer Leverkusen. We saw how they struggled in the last season with Xabi Alonso and now he is no longer there with them. Change at a head coach position leads to tactical changes which are so uncertain for any club, not only Bayer Leverkusen.
Additionally, Bayer Leverkusen lost not only Tah, Wirtz but also Frimpong who are all important for their defense and attacking system. Even if Bayer Leverkusen still have Xabi Alonso for a next season, they will still severely struggle to maintain their runner-up position in Bundesliga, not mention about winning the league title.
Bit difficult for Erik ten Hag how three players above become important part for Leverkusen under Alonso era and so far Leverkusen not announce about new players for filling that position. Another bad side of Bundesliga easily selling their main players to rival team such as did by Dortmund, Bayern Leverkusen when selling their player to Bayern Munich.
Ten Hag will deal with all those challenges but looking at how he did very bad management in Manchester United, I lack of belief in his management for Bayer Leverkusen. With strong domination of Bayern Munich in Bundesliga, it's almost impossible for Ten Hag to win the trophy with his new club.