It is completely fair to be worried about Bayer Leverkusen next season especially with challenges from transfer window. We have seen with Girona that losing important players can really hurt performance which puts much of pressure on new players and management. However there is always chance for surprise in football. Sometimes team can still do well even after big changes. New coach Erik ten Hag has history of taking on tough jobs so fans are hopeful he can build another strong team that can compete at top.
Bad reputation of Erik ten Hag when becoming Manchester United's coach and Bayern Leverkusen losses several important players not really sure will easily raise the top standings finish next season. Comparison with any players leaving the club and new recruitment not really balance yet seems difficulty for Leverkusen existing at the 2nd standings or get in the Bundesliga tittle race with Bayern Munich have recruited many top players recently.
Build up strong teams have to sign any top players and Bayern Leverkusen management looks not really loyal spending out much money to sign star players, losses many key players last season and sold them with most expensive fees transfer but Leverkusen management looks not really supported for Erik ten Hag to sign star player. Recently one important players last season Granit Xhaka have leave Bayern Leverkusen and returning back to Premier League for joining with promotion team Sunderland.