Mikel Arteta a headache as the Arsenal boss prepares for this summer’s transfer window.Many thought that the Spaniard would focus on strengthening his defence when the window opens with the likes of Luiz, Sead Kolasinac and Shkodran Mustafi appearing to be prone to errors.William Saliba will return to the Emirates with the youngster having been on loan at Saint-Etienne since signing from the French outfit last summer.Though Arteta may now have a rethink with Luiz having impressed in recent weeks, being named man of the match as Arsenal beat Manchester City on Saturday to reach the FA Cup final.Luiz has shown a new level of maturity since an individual error that cost the Gunners a goal and a foul that earned City a penalty and himself a red.
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