Alonso’s departure will definitely be felt in terms of charisma and the confidence he instilled, but Ten Hag now has a chance to reshape Leverkusen into a different but still competitive team. The Bundesliga has often seen clubs rise when a coach maximizes limited resources, this doesn't mean Leverkusen should relent on new signings, If the take advantage of the transfer market and make some smart signing they will stand a better chance of competing for the title.
Alonso gave Leverkusen a chance to feel more confident then they have ever felt as a team, he also Instilled a strong winning mentality that reshaped their minds into not settling for a defeat even at times when it felt like they were already defeated, he will be missed by the team and even the players. Ten Hag has got a challenge with his relationship with players and that has affected how he relates with his players and to a great extent it may be the reason for the kind of results he gets, I am hoping he does better with Leverkusen as time goes on.
Alonso leaving Bayern Leverkusen will really really affect them at the same time I'm thinking it's because he left the club that's why some players too left the club to other clubs. Alonso really brought out the best out of this Leverkusen team. Ten Hang has a mountain to climb because the fans will be expecting a lot from him when the season starts.