Arsenal training session ahead of Dortmund match in London [Getty Images]

LONDON, ENGLAND - NOVEMBER 25: Arsene Wenger, manager of Arsenal takes part in a training session ahead of the UEFA Champions League football match with Borussia Dortmund at Arsenal Football Club Training Ground in Shenley, Hertfordshire, London, England on November 25, 2014. (Photo by Kieran Galvin/Anadolu Agency/Getty Images)

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