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Arsenal's German defender Per Mertesacker (bottom) vies with Olympiacos' Nigerian forward Ideye Brown during the UEFA Champions League Group F football match between Olympiacos and Arsenal at the Georgios Karaiskakis Stadium in Piraeus near Athens on December 9, 2015. AFP PHOTO / ANGELOS TZORTZINIS / AFP / ANGELOS TZORTZINIS (Photo credit should read ANGELOS TZORTZINIS/AFP via Getty Images)

Arsenal's German defender Per Mertesacker (bottom) vies with Olympiacos' Nigerian forward Ideye Brown during the UEFA Champions League Group F football match between Olympiacos and Arsenal at the Georgios Karaiskakis Stadium in Piraeus near Athens on December 9, 2015.  AFP PHOTO / ANGELOS TZORTZINIS / AFP / ANGELOS TZORTZINIS        (Photo credit should read ANGELOS TZORTZINIS/AFP via Getty Images)