LONDON, ENGLAND - JULY 28: Per Mertesacker of Arsenal during a training session at Emirates Stadium on July 28, 2015 in London, England. (Photo by David Price/Arsenal FC via Getty Images)
LONDON, ENGLAND - JULY 28: Per Mertesacker of Arsenal during a training session at Emirates Stadium on July 28, 2015 in London, England. (Photo by David Price/Arsenal FC via Getty Images)