Chelsea were strongly interested in Napoli defender Kalidou Koulibaly last season, but the Italian club resisted every Chelsea advances and held on to their defender.
Recent reports now claim Chelsea have gone back to the Senegal international and have made a £52.5m bid for the 25-year-old.
Italian outlet TMW say Chelsea have made the monster bid, as Chelsea are unsure of current targets Leonardo Bonucci and Virgil van Dijk.
Antonio Conte is said to be an admirer of the Napoli star and showed strong interest in the defender last summer with Chelsea believed to have offered £40m for Koulibaly when he took charge as Chelsea boss at this time last year.
In the end it was David Luiz who re-signed for Chelsea and helped the Blues to the Premier League title.