German media keeps burying him. He must have been a complete asshole during his short time, for Leverkusen to keep on kicking him when he's already down. Leverkusen didn't even include a PR "thank you" in their statement. Things must have been very ugly behind the scene.
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According to SPORT BILD, Ten Hag was quickly removed from the club's most intimate circle. He was also told there was no turning back. With his constant public demands for new players and the breach of trust with Granit's departure,
His relationships within the dressing room were equally strained. Coaches, physiotherapists, doctors, nutrition experts, team organizers, his own new coaching staff—he couldn't connect with anyone. In this particular area, the experienced coach had been trusted to be a unifying force. He wasn't. There was no leadership and no direction.
The former Manchester United coach failed to convey any ideas to the new Leverkusen team. No one knew what to do. Not even when they were leading 3-1 against Werder Bremen.
There were individual actions, but no game plan. In the locker room, people puzzled over why push-ups seemed to have a similar importance in training as running and passing – and not just on the first few days for the losers of training games to amuse themselves during the unusually long sessions.