ST ALBANS, ENGLAND - JULY 06: Per Mertesacker of Arsenal during a training session at London Colney on July 6, 2017 in St Albans, England. (Photo by Stuart MacFarlane/Arsenal FC via Getty Images)
ST ALBANS, ENGLAND - JULY 06: Per Mertesacker of Arsenal during a training session at London Colney on July 6, 2017 in St Albans, England. (Photo by Stuart MacFarlane/Arsenal FC via Getty Images)