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SYDNEY, AUSTRALIA - JULY 13: Per Mertesacker celebrates scoring a goal for Arsenal with Sead Kolasinac, Krystian Bielik and Francis Coquelin during the match between Sydney FC and Arsenal at ANZ Stadium on July 13, 2017 in Sydney, Australia. (Photo by David Price/Arsenal FC via Getty Images)

SYDNEY, AUSTRALIA - JULY 13:  Per Mertesacker celebrates scoring a goal for Arsenal with Sead Kolasinac, Krystian Bielik and Francis Coquelin during the match between Sydney FC and Arsenal at ANZ Stadium on July 13, 2017 in Sydney, Australia.  (Photo by David Price/Arsenal FC via Getty Images)