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Leverkusen's forward Stefan Kiessling poses during a team presentation of Bayer Leverkusen, on July 25, 2016 in Leverkusen, western Germany. / AFP / PATRIK STOLLARZ (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

Leverkusen's forward Stefan Kiessling poses during a team presentation of Bayer Leverkusen, on July 25, 2016 in Leverkusen, western Germany. / AFP / PATRIK STOLLARZ        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

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Leverkusen's midfielder Lars Bender poses during a team presentation of Bayer Leverkusen, on July 25, 2016 in Leverkusen, western Germany. / AFP / PATRIK STOLLARZ (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

Leverkusen's midfielder Lars Bender poses during a team presentation of Bayer Leverkusen, on July 25, 2016 in Leverkusen, western Germany. / AFP / PATRIK STOLLARZ        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

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Leverkusen's Greek defender Kyriakos Papadopoulos poses during a team presentation of Bayer Leverkusen on July 25, 2016 in Leverkusen, western Germany. / AFP / Patrik STOLLARZ (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

Leverkusen's Greek defender Kyriakos Papadopoulos poses during a team presentation of Bayer Leverkusen on July 25, 2016 in Leverkusen, western Germany. / AFP / Patrik STOLLARZ        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

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Leverkusen's defender Roberto Hilbert poses during a team presentation of Bayer Leverkusen, on July 25, 2016 in Leverkusen, western Germany. / AFP / PATRIK STOLLARZ (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

Leverkusen's defender Roberto Hilbert poses during a team presentation of Bayer Leverkusen, on July 25, 2016 in Leverkusen, western Germany. / AFP / PATRIK STOLLARZ        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

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Leverkusen's Croatian defender Tin Jedvaj poses during a team presentation of Bayer Leverkusen, on July 25, 2016 in Leverkusen, western Germany. / AFP / PATRIK STOLLARZ (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

Leverkusen's Croatian defender Tin Jedvaj poses during a team presentation of Bayer Leverkusen, on July 25, 2016 in Leverkusen, western Germany. / AFP / PATRIK STOLLARZ        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)