Marco Reus (L) of Dortmund vies with Robert Andrich of Union Berlin 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)

Manuel Akanji (L) of Dortmund vies for header with Martin Sebastian Andersson of Union Berlin during a German Bundesliga match between Borussia Dortmund and FC Union Berlin in Dortmund, Germany, Feb. 1, 2020. (Photo by Joachim Bywaletz/Xinhua)

Marco Reus (R) of Dortmund vies with Kevin Schlotterbeck of Union Berlin during a German Bundesliga match between Borussia Dortmund and FC Union Berlin in Dortmund, Germany, Feb. 1, 2020. (Photo by Joachim Bywaletz/Xinhua)