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The 25-year-old impressed for the Serie A side last season, making 33 appearances as his side finished runners-up to Juventus.

And his form apparently caught the eye of new Blues boss Antonio Conte, with the Italian eyeing the Senegal international as he overhauls his squad following their unexpected 10th place Premier League finish in May.

The new Stamford Bridge supremo has already taken Michy Batshuayi and N’Golo Kante to west London in deals totalling more than £65m this summer.

But his spending spree shows no sign of ending any time soon, with the Daily Mirror suggesting Chelsea are planning to launch a renewed £40m move this week.

That figure would represent a £2m increase on the £38m bid they were said to have made last Wednesday.

(Image: GETTY)

Napoli are under no pressure to sell though, following the £75m sale of Argentinian hitman Gonzalo Higuain to domestic rivals Juventus.

Chelsea’s hopes of concluding Koulibaly’s capture will be boosted by the news Napoli manager Maurizio Sarri is lining up his replacement though.

According to Sky Sport Italia, the 57-year-old has made a £22m offer, rising to £25m, for Torino defender Nikola Maksimovic.