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The 21-year-old is on the Gunners radar, as Unai Emery plans for his second transfer window in charge of the North London club.
Under was in Champions League action for his club side against Viktoria Plzen, and got himself on the scoresheet in the 2-1 defeat.
It was his fifth goal of the season for the Serie A outfit, where he has impressed since moving from his native Turkey in 2017.
And Gazzetta dello Sport report that he was watched on from the stands by a member of the Gunners scouting team.