Kieran Tierney limped off during the second half of their clash with Southampton. The left-back was back in the starting lineup for Mikel Arteta's men and had impressed down the left hand side yet again as the Gunners looked to get their first win of the season.But he missed the last 20 minutes after he had gone down and needed treatment before limping off and being replaced by Sead Kolasinic.
The former Celtic star has been plagued with hip problems since moving to North London last summer and Arteta will be desperate for this not to a serious problem.
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