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The Gunners make the trip to the Etihad on Sunday to face Pep Guardiola’s in-form Premier League leaders.

City have been superb so far this season, with their summer signings bringing a new dynamic to their team.

But Merson believes they have a weak link at left-back and he wants to see Arsene Wenger play Walcott to exploit it.

He told Sky Sports: “I like what Pep Guardiola has done in bringing in Kyle Walker. Going forward he's among the best in the world in that position.

“The left-back position is the one concern with Fabian Delph going in there, but nobody has a go at them.

“I would play Theo Walcott on the right when Arsenal visit Manchester City on Sunday and have a right go at that area, because that's their Achilles heel.”

There has been a lot of talk about Arsenal’s Invincible side ahead of this weekend’s clash with City being tipped to replicate that stunning achievement.

Guardiola’s side have only dropped two points so far this term but Merson insists it’s far too early to talk of them going the whole campaign unbeaten.

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He added: “I don't like the talk of Manchester City going the whole season without losing a game. When Arsenal did it, it was a miracle and they drew 12 of those, so that's 12 games in the balance.

“However, they do look good and champions in waiting.

“The teams behind them are panicking and going forward they are unstoppable. West Brom scored two last weekend but Manchester City could have scored 10.”