ST ALBANS, ENGLAND - SEPTEMBER 10: (L-R) Tomas Rosicky and Per Mertesacker laugh before the Arsenal squad photograph at London Colney on September 10, 2015 in St Albans, England. (Photo by Stuart MacFarlane/Arsenal FC via Getty Images)
ST ALBANS, ENGLAND - SEPTEMBER 10: (L-R) Tomas Rosicky and Per Mertesacker laugh before the Arsenal squad photograph at London Colney on September 10, 2015 in St Albans, England. (Photo by Stuart MacFarlane/Arsenal FC via Getty Images)