ST ALBANS, ENGLAND - SEPTEMBER 28: (L-R) Per Mertesacker and Petr Cech of Arsenal before a training session at London Colney on September 28, 2015 in St Albans, England. (Photo by Stuart MacFarlane/Arsenal FC via Getty Images)
ST ALBANS, ENGLAND - SEPTEMBER 28: (L-R) Per Mertesacker and Petr Cech of Arsenal before a training session at London Colney on September 28, 2015 in St Albans, England. (Photo by Stuart MacFarlane/Arsenal FC via Getty Images)