PIRAEUS, GREECE - DECEMBER 09: Petr Cech, Per Mertesacker, Olivier Giroud, and Theo Walcott of Arsenal celebrate at the end of Arsenal's win in the UEFA Champions League Group F match between Olympiacos FC and Arsenal FC at Karaiskakis Stadium on December 9, 2015 in Piraeus, Greece. (Photo by Michael Regan/Getty Images)
