3 takeaways from Arsenal's 3-1 win over Southampton in the Premier League

3. Normally water-tight defence starting to leak

Shipping two goals to Manchester City could be excused, especially when Arsenal played most of that game with 10 men. Conceding twice against the Foxes was a little tougher to explain, even if one of James Justin's goals was a wonder striker he'll struggle to repeat for the rest of his career.

There's hardly any justification for how easily substitute Archer stole in to put Southampton ahead just 10 minutes after the restart. The lack of cohesion and alertness at the back was uncharacteristic of what has long been the strength of Arteta's group.

Injuries and changing personnel at fullback haven't helped. Thomas Partey stepped in at right-back with Jurrien Timber and Benjamin White out, while Riccardo Calafiori continued to find his feet on the left amid his first exposure to England's top flight.

Continuity is key at the back, and while that's been interrupted slightly, the Gunners would ignore the recent vulnerability defensively at their peril. The trio of goalkeeper David Raya and central defenders William Saliba and Gabriel Magalhaes, ably protected by Declan Rice and Jorginho, should be enough to keep the door shut, but teams are beginning to find weaknesses in the Arsenal rearguard plan.

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