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Kalidou Koulibaly to Chelsea is the transfer rumour which just never seems to go away.

And despite appearing to be more interested in the likes of Virgil van Dijk and namely Leonardo Bonucci, Koulibaly has once again emerged on the Blues' radar following quotes from his agent about his future.

Koulibaly has been regularly linked with a move to Stamford Bridge, with intense speculation over a possible switch from Napoli last summer.

Antonio Conte is keen to revamp his central defensive options and offer competition for Gary Cahill, whose shortcomings were exposed for England against France on Tuesday night.

Chelsea eventually opted for the return of David Luiz from PSG in 2016 but reports in in Italy indicate Napoli have a gentleman's agreement with the defender that he would be allowed to depart should an offer of £52m arrive.

And should their respective pursuits of Van Dijk and Bonucci falter, Koulibaly could represent one alternative for Conte as he bids to replace the outgoing John Terry, with Koulibaly's agent's comments adding further fuel to the fire.

"Koulibaly? The transfer market is long as it will be open until August 31, something might happen before then," he told Mondo Napoli.

"Chelsea? They are a world class team that many players would like to join but I don't want to talk about this now."