Arsenal are watching closely Napoli defender Kalidou Koulibaly.

Calciomercato.com says Arsenal are keeping tabs on Koulibaly.

The Gunners are poised to recruit defenders this summer after failing to land reinforcements during the January window.

Arsenal sent a team of scouts to watch Koulibaly in Napoli's Europa League clash with RB Leipzig on Thursday night.

Koulibaly is valued at around £40million - but the price is only set to rise due to market inflation.