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PIRAEUS, GREECE - DECEMBER 09: Olivier Giroud celebrates scoring the 2nd Arsenal goal during the UEFA Champions League group F stage match between Olympiacos and Arsenal at the Karaiskakis Stadium on December 9, 2015 in Piraeus, Greece. (Photo by Stuart MacFarlane/Arsenal FC via Getty Images)

PIRAEUS, GREECE - DECEMBER 09:  Olivier Giroud celebrates scoring the 2nd Arsenal goal during the UEFA Champions League group F stage match between Olympiacos and Arsenal at the Karaiskakis Stadium on December 9, 2015 in Piraeus, Greece.  (Photo by Stuart MacFarlane/Arsenal FC via Getty Images)