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LONDON, ENGLAND - OCTOBER 19: Alexis Sanchez celebrates scoring Arsenal's 1st goal with Santi Cazorla during the UEFA Champions League match between Arsenal FC and PFC Ludogorets Razgrad at Emirates Stadium on October 19, 2016 in London, England. (Photo by David Price/Arsenal FC via Getty Images)

LONDON, ENGLAND - OCTOBER 19:  Alexis Sanchez celebrates scoring Arsenal's 1st goal with Santi Cazorla during the UEFA Champions League match between Arsenal FC and PFC Ludogorets Razgrad at Emirates Stadium on October 19, 2016 in London, England.  (Photo by David Price/Arsenal FC via Getty Images)