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Axel Witsel (front) of Dortmund competes during a German Bundesliga match between Borussia Dortmund and FC Union Berlin in Dortmund, Germany, Feb. 1, 2020. (Photo by Joachim Bywaletz/Xinhua)

Axel Witsel (front) of Dortmund competes during a German Bundesliga match between Borussia Dortmund and FC Union Berlin in Dortmund, Germany, Feb. 1, 2020. (Photo by Joachim Bywaletz/Xinhua)