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It would be much better if Leverkusen were better prepared to compete for the Bundesliga title this season with their new manager, making the Bundesliga much more competitive. But if Bayern Munich doesn't face any opposition comparable, there will be nothing interesting about this season's Bundesliga competition. Ten Hag's challenge will not be easy because his current team still has many weaknesses. Moreover, they are missing several key players, making it even more difficult for him. Doubts about the manager's abilities will also influence Leverkusen's results this season.
Judging by the player material that Leverkusen has, Ten Hag will have a difficult first season. I don't see Leverkusen being able to give Bayern Munich any competition in the Bundesliga title race, not because I underestimate the strength of the squad that Ten currently has, but the level that Bayern Munich is at is very difficult for other clubs to match.
Based on last season experience when Leverkusen was still managed by Xabi Alonso and still had the majority of the players who won the title, they are starting to struggle to compete with Munich, especially now that their squad has undergone a major overhaul, it is clear that Bayern Munich current position is similar to PSG in Ligue 1.