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Borussia Dortmund CEO Hans: Jurgen Klopp's decision to join Red Bull as their "Global Head of Soccer" has sparked strong reactions from many German fans. Klopp, who once embodied the romantic ideals of football by coaching the underdog Mainz to the first division, reviving a struggling Dortmund, and restoring glory to Liverpool, is now seen as switching allegiances.

For years, Red Bull has faced criticism from fans worried about the increasing commercialization of the sport they love. Klopp, to many, represented the guardian of traditional football values, a hard-working, authentic figure who connected with the crowd.

Now, at 57, Klopp has returned to the football scene earlier than expected, in a surprising new role, and has faced ridicule and criticism. He had previously announced plans to take a sabbatical, saying he needed time to recharge after "running out of energy."