Still been disappointed at Leverkusen at this time may mean you had a very huge expectation from them and you probably esteemed the preseason game to a good extent but then it is possible same is not what Leverkusen was about or that particular game, Leverkusen may ha e seen that game as just training and helping their opponent gain confidence when they go back to play at their level. It may surprise you to know that some of the Leverkusen players may even be at their best and will be really in their best form waiting for the season to commence and have just used that game to warm up.
And Leverkusen is an amazing club, and they can do extraordinary, so there is a lot for Ten Hag to do because when they are not serious because if the club is not serious, then they will not do well, and all the blame is going to be on Ten Hag. and when a club have confidence then it goes a long way for the club. After all, when things are out of place for a club, because when a club has self-esteem, then it helps the club to also go a long way, and Leverkusen needs to do more if they want to stand out. After all, they need to be serious, and we already know the kind of club that Leverkusen is they have the stamina; they just need to put in more effort because they are the defending champions