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LONDON, ENGLAND - SEPTEMBER 29: Theo Walcott scores a goal for Arsenal past Roberto and Dimitris Siovas of Olympiacos during the match between Arsenal and Olympiacos on September 29, 2015 in London, United Kingdom. (Photo by David Price/Arsenal FC via Getty Images)

LONDON, ENGLAND - SEPTEMBER 29:  Theo Walcott scores a goal for Arsenal past Roberto and Dimitris Siovas of Olympiacos during the match between Arsenal and Olympiacos on September 29, 2015 in London, United Kingdom.  (Photo by David Price/Arsenal FC via Getty Images)