3-4-2-1: Arsenal's Strongest Possible XI vs Southampton

Arsenal lost their last league game vs Manchester United but bounced back to beat BATE Borisov 6-0 in the Europa League.
Next up, the North Londoners will collide against Southampton away from home. Who will come out on top?
As far as the team news is concerned, most of the key stars were rested for the game in the midweek and we can expect them to return.
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German international Shkofran Mustafi is suffering from a thigh muscle strain and he should be out of tomorrow’s contest. Therefore, Per Mertesacker will probably start in the defense with Koscielny and Monreal.
Xhaka and Ramsey should start in the central midfield and the likes of Bellerin and Kolasinac must play in the wing-back positions. In the attack, Ozil and Alexis should start behind lone center forward Alexandre Lacazette.
Here is Arsenal’s strongest possible 3-4-2-1 XI vs Southampton.