Per Mertesacker has been accused of picking his nose and then wiping his soiled hands in a mascot's hair.
In a clip circulating on social media, the Arsenal defender is seen appearing to perform the deed as he waited in the tunnel prior to the Gunners' 2-1 victory over Manchester City last week.
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Speaking after the triumph, Mertesacker was full of praise for his side's playing styles as they aim to secure their first title in 12 years.
