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3. Left back dilemma
Riccardo Calafiori was a surprise starter in Arsenal's opening win at United, but he repaid Arteta's faith in the perfect way.
The Italy international scored the winning goal from a corner and put in an all-round good performance before being taken off with just under 20 minutes to play. However, his showing has created a dilemma for his manager.
Myles Lewis-Skelly was tipped to be the Gunners' first-choice left back this season, but now appears to have competition from Calafiori. The ex-Bologna man is expected to start once again on Saturday, but Arteta certainly has a decision to make over who he plays on the left side of defence in this game and future matches.