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LONDON, ENGLAND - JANUARY 24: Arsene Wenger, Manager of Arsenal looks on as Per Mertesacker of Arsenal walks off the pitch after receiving a red card during the Barclays Premier League match between Arsenal and Chelsea at Emirates Stadium on January 24, 2016 in London, England. (Photo by Shaun Botterill/Getty Images)

LONDON, ENGLAND - JANUARY 24:  Arsene Wenger, Manager of Arsenal looks on as Per Mertesacker of Arsenal walks off the pitch after receiving a red card during the Barclays Premier League match between Arsenal and Chelsea at Emirates Stadium on January 24, 2016 in London, England.  (Photo by Shaun Botterill/Getty Images)