Ten Hag was looking for a team to prove himself, and Leverkusen was one of the best options. Luckily, Leverkusen gave him that opportunity. Now, with their transfers, they'll be looking to improve their league standings against Bayern Munich. Ten Hag, who will be trying to prove himself, must fill Xabi's void in the best way possible and make sure the fans don't miss him. Several players have left the team, and the resulting void needs to be filled in the best possible way.
Ten Hag joined Manchester United and Bayer Leverkusen at different times and situations of those clubs. He joined Mnachester United when they were in a crisis and he failed to help them. While he signed a contract with Bayer Leverkusen after this club had two successful seasons with Xabi Alonso and a task of Ten Hag is maintaining good performances for the club after Xabi Alonso era.
This club was not in any crisis like Manchester United but with many star players leaving the club like Wirtz, Tah and Frimpong, even more to leave in last weeks of summer transfer market, Ten Hag will have to deal with a lot of challenge there.