Mertens was on the Blues’ radar during the winter transfer window but the Belgium international made the U-turn and decided to remain with Napoli for the rest for the campaign.
As a result, Olivier Giroud was declined the opportunity to join Inter Milan before the January transfer deadline and the Blues have recently exercised the one-year extension clause to keep him at the club until June 2021.
According to Gianluca di Marzio, the west London side are still keen on securing the signature of Mertens, who has yet to renew his contract with Napoli beyond the current campaign.