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DORTMUND, GERMANY - DECEMBER 20: Julian Weigl of Borussia Dortmund is extending his contract with the club till 2021prior the Bundesliga match between Borussia Dortmund and FC Augsburg at Signal Iduna Park on December 20, 2016 in Dortmund, Germany. (Photo by Alexandre Simoes/Borussia Dortmund/Getty Images)

DORTMUND, GERMANY - DECEMBER 20: Julian Weigl of Borussia Dortmund is extending his contract with the club till 2021prior the Bundesliga match between Borussia Dortmund and FC Augsburg at Signal Iduna Park on December 20, 2016 in Dortmund, Germany.  (Photo by Alexandre Simoes/Borussia Dortmund/Getty Images)