The Senegal international was in superb form for the Naples outfit last season, averaging 2.5 tackles, interceptions and successful aerial duels per match as his side claimed a runner-up finish in Serie A.
The 25-year-old has been linked with the Blues for much of the summer transfer window amid an ongoing contract dispute at Stadio San Paolo.
Thus far, Chelsea’s interest hasn’t materialised into formal deal with the Serie A side, but that could all be about to change.
Indeed, Italian outlet Calcio Mercato claim Chelsea are due to launch a £48million bid for the 6 foot 5 centre-half within the next few hours.
That was their word at 9:28 this morning, so we could receive confirmation of a formal offer from the Blues by the end of the day.