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Mainz' head coach Thomas Tuchel sits in the crowd during the German first division Bundesliga football match Borussia Moenchengladbach vs FSV Mainz 05 in the western German city of Moenchengladbach on December 18, 2011. AFP PHOTO / PATRIK STOLLARZ RESTRICTIONS / EMBARGO - DFL LIMITS THE USE OF IMAGES ON THE INTERNET TO 15 PICTURES (NO VIDEO-LIKE SEQUENCES) DURING THE MATCH AND PROHIBITS MOBILE (MMS) USE DURING AND FOR FURTHER TWO HOURS AFTER THE MATCH. FOR MORE INFORMATION CONTACT DFL. (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

Mainz' head coach Thomas Tuchel sits in the crowd during the German first division Bundesliga football match Borussia Moenchengladbach vs FSV Mainz 05 in the western German city of Moenchengladbach on December 18, 2011. AFP PHOTO / PATRIK STOLLARZ RESTRICTIONS / EMBARGO - DFL LIMITS THE USE OF IMAGES ON THE INTERNET TO 15 PICTURES (NO VIDEO-LIKE SEQUENCES) DURING THE MATCH AND PROHIBITS MOBILE (MMS) USE DURING AND FOR FURTHER TWO HOURS AFTER THE MATCH. FOR MORE INFORMATION CONTACT DFL. (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)
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AFP PATRIK STOLLARZ

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MOENCHENGLADBACH, GERMANY - JANUARY 23: Thomas Tuchel, coach of Borussia Dortmund looks on prior to the Bundesliga match between Borussia Moenchengladbach and Borussia Dortmund at Borussia-Park on January 23, 2016 in Moenchengladbach, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)

MOENCHENGLADBACH, GERMANY - JANUARY 23: Thomas Tuchel, coach of Borussia Dortmund looks on prior to the Bundesliga match between Borussia Moenchengladbach and Borussia Dortmund at Borussia-Park on January 23, 2016 in Moenchengladbach, Germany. (Photo by Alex Grimm/Bongarts/Getty Images)
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Bongarts Alex Grimm

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MOENCHENGLADBACH, GERMANY - JANUARY 23: Head coach Thomas Tuchel of Dortmund looks on during the Bundesliga match between Borussia Moenchengladbach and Borussia Dortmund at Borussia-Park on January 23, 2016 in Moenchengladbach, Germany. (Photo by Christof Koepsel/Getty Images For MAN)

MOENCHENGLADBACH, GERMANY - JANUARY 23: Head coach Thomas Tuchel of Dortmund looks on during the Bundesliga match between Borussia Moenchengladbach and Borussia Dortmund at Borussia-Park on January 23, 2016 in Moenchengladbach, Germany. (Photo by Christof Koepsel/Getty Images For MAN)
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Getty Images Sport Christof Koepsel

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Dortmund's head coach Thomas Tuchel reacts during the German first division football Bundesliga match Borussia Moenchengladbach vs Borussia Dortmund in Moenchengladbach, western Germany, on January 23, 2016. / AFP / PATRIK STOLLARZ / RESTRICTIONS: DURING MATCH TIME: DFL RULES TO LIMIT THE ONLINE USAGE TO 15 PICTURES PER MATCH AND FORBID IMAGE SEQUENCES TO SIMULATE VIDEO. == RESTRICTED TO EDITORIAL USE == FOR FURTHER QUERIES PLEASE CONTACT DFL DIRECTLY AT + 49 69 650050 (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

Dortmund's head coach Thomas Tuchel reacts during the German first division football Bundesliga match Borussia Moenchengladbach vs Borussia Dortmund in Moenchengladbach, western Germany, on January 23, 2016. / AFP / PATRIK STOLLARZ / RESTRICTIONS: DURING MATCH TIME: DFL RULES TO LIMIT THE ONLINE USAGE TO 15 PICTURES PER MATCH AND FORBID IMAGE SEQUENCES TO SIMULATE VIDEO. == RESTRICTED TO EDITORIAL USE == FOR FURTHER QUERIES PLEASE CONTACT DFL DIRECTLY AT + 49 69 650050 (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)
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AFP PATRIK STOLLARZ

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MOENCHENGLADBACH, GERMANY - MAY 03: Headcoach Thomas Tuchel of Mainz smiles at the Bundesliga match between Borussia Moenchengladbach and Mainz 05 at Borussia-Park on May 3, 2014 in Moenchengladbach, Germany. (Photo by Juergen Schwarz/Bongarts/Getty Images)

MOENCHENGLADBACH, GERMANY - MAY 03: Headcoach Thomas Tuchel of Mainz smiles at the Bundesliga match between Borussia Moenchengladbach and Mainz 05 at Borussia-Park on May 3, 2014 in Moenchengladbach, Germany. (Photo by Juergen Schwarz/Bongarts/Getty Images)
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Bongarts Juergen Schwarz