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Dortmund's Gabonese striker Pierre-Emerick Aubameyang celebrates after his goal during the German Cup DFB Pokal third round match between Borussia Dortmund and FC Augsburg in Augsburg on December 16, 2015. / AFP / Christof STACHE / RESTRICTIONS: ACCORDING TO DFB RULES IMAGE SEQUENCES TO SIMULATE VIDEO IS NOT ALLOWED DURING MATCH TIME. MOBILE (MMS) USE IS NOT ALLOWED DURING AND FOR FURTHER TWO HOURS AFTER THE MATCH. == RESTRICTED TO EDITORIAL USE == FOR MORE INFORMATION CONTACT DFB DIRECTLY AT +49 69 67880 / (Photo credit should read CHRISTOF STACHE/AFP/Getty Images)

Dortmund's Gabonese striker Pierre-Emerick Aubameyang celebrates after his goal during the German Cup DFB Pokal third round match between Borussia Dortmund and FC Augsburg in Augsburg on December 16, 2015. / AFP / Christof STACHE / RESTRICTIONS: ACCORDING TO DFB RULES IMAGE SEQUENCES TO SIMULATE VIDEO IS NOT ALLOWED DURING MATCH TIME. MOBILE (MMS) USE IS NOT ALLOWED DURING AND FOR FURTHER TWO HOURS AFTER THE MATCH. == RESTRICTED TO EDITORIAL USE == FOR MORE INFORMATION CONTACT DFB DIRECTLY AT +49 69 67880 / (Photo credit should read CHRISTOF STACHE/AFP/Getty Images)
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AFP CHRISTOF STACHE

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DORTMUND, GERMANY - SEPTEMBER 20: Pierre-Emerick Aubameyang of Dortmund celebrates his team's third goal during the Bundesliga match between Borussia Dortmund and Bayer Leverkusen at Signal Iduna Park on September 20, 2015 in Dortmund, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)

DORTMUND, GERMANY - SEPTEMBER 20: Pierre-Emerick Aubameyang of Dortmund celebrates his team's third goal during the Bundesliga match between Borussia Dortmund and Bayer Leverkusen at Signal Iduna Park on September 20, 2015 in Dortmund, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)
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Bongarts Alex Grimm

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Gabonese striker Pierre-Emerick Aubameyang poses with the African Footballer of the Year Award during 2015 Glo-CAF Awards in Abuja, on January 7, 2016. AFP PHOTO/PIUS UTOMI EKPEI / AFP / PIUS UTOMI EKPEI (Photo credit should read PIUS UTOMI EKPEI/AFP/Getty Images)

Gabonese striker Pierre-Emerick Aubameyang poses with the African Footballer of the Year Award during 2015 Glo-CAF Awards in Abuja, on January 7, 2016. AFP PHOTO/PIUS UTOMI EKPEI / AFP / PIUS UTOMI EKPEI (Photo credit should read PIUS UTOMI EKPEI/AFP/Getty Images)
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AFP PIUS UTOMI EKPEI

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DORTMUND, GERMANY - SEPTEMBER 20: Pierre-Emerick Aubameyang of Dortmund celebrates his team's third goal during the Bundesliga match between Borussia Dortmund and Bayer Leverkusen at Signal Iduna Park on September 20, 2015 in Dortmund, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)

DORTMUND, GERMANY - SEPTEMBER 20: Pierre-Emerick Aubameyang of Dortmund celebrates his team's third goal during the Bundesliga match between Borussia Dortmund and Bayer Leverkusen at Signal Iduna Park on September 20, 2015 in Dortmund, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)
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Bongarts Alex Grimm

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HANOVER, GERMANY - SEPTEMBER 12: Pierre-Emerick Aubameyang of Dortmund celebrates scoring his goal during the Bundesliga match between Hannover 96 and Borussia Dortmund at HDI-Arena on September 12, 2015 in Hanover, Germany. (Photo by Nigel Treblin/Bongarts/Getty Images)

HANOVER, GERMANY - SEPTEMBER 12: Pierre-Emerick Aubameyang of Dortmund celebrates scoring his goal during the Bundesliga match between Hannover 96 and Borussia Dortmund at HDI-Arena on September 12, 2015 in Hanover, Germany. (Photo by Nigel Treblin/Bongarts/Getty Images)
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Bongarts Nigel Treblin