![Lens defeat highlights Mikel Arteta's biggest problem for Arsenal ahead of Man City clash](https://cdn.newsserve.net/ONPglobe256.png)
Lens defeat highlights Mikel Arteta's biggest problem for Arsenal ahead of Man City clash
Arsenal winger Gabriel Martinelli's absence was felt massively as Mikel Arteta's side lost 2-1 to RC Lens in the Champions League on Tuesday evening
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