ST ALBANS, ENGLAND - SEPTEMBER 21: Per Mertesacker of Arsenal during the Arsenal Squad photos at London Colney on September 21, 2016 in St Albans, England. (Photo by David Price/Arsenal FC via Getty Images)
ST ALBANS, ENGLAND - SEPTEMBER 21: Per Mertesacker of Arsenal during the Arsenal Squad photos at London Colney on September 21, 2016 in St Albans, England. (Photo by David Price/Arsenal FC via Getty Images)