Just like in previous years, Arsenal's defence has been their Achilles heel with 45 goals conceded this season in the league.
Last weekend, an error by Sead Kolasinac proved costly as they lost the north London derby to Tottenham.
While at various times, David Luiz and Shkodran Mustafi have committed crucial mistakes.
In an attempt to provide greater security, Arteta has switched to five at the back but it has meant their attacking edge has dipped as a result.
Is John Stones the answer to Arsenal's problems in defence? (Image: GETTY)
Arteta spent three years at City and worked alongside Stones, who has failed to justify his £50million price tag.
Stones has fallen out of favour with Pep Guardiola and recently admitted he has been frustrated by his injuries problems which have prevented him from fighting for his spot.
Arteta wants to encourage his defenders to play out from the back which would make Stones ideally suited to his philosophy.
And Merson believes that among at least three signings Arteta needs to make, Stones should be high on his wishlist.
Mikel Arteta wants to strengthen his Arsenal squad (Image: GETTY)
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“Arsenal need an out and out defender, not another David Luiz who knows how to play the ball out from the back but makes a lot of mistakes.
“But Stones is English, young enough to improve, and Arteta will know all about him and know he fits into the system."
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