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DORTMUND, GERMANY - SEPTEMBER 17: Gonzalo Castro celebrates after scoring the opening goal during the Bundesliga match between Borussia Dortmund and SV Darmstadt 98 at Signal Iduna Park on September 17, 2016 in Dortmund, Germany. (Photo by Alexandre Simoes/Borussia Dortmund/Getty Images)

DORTMUND, GERMANY - SEPTEMBER 17:  Gonzalo Castro celebrates after scoring the opening goal during the Bundesliga match between Borussia Dortmund and SV Darmstadt 98 at Signal Iduna Park on September 17, 2016 in Dortmund, Germany.  (Photo by Alexandre Simoes/Borussia Dortmund/Getty Images)