The 26-year-old is a key member of the Napoli side and very much the fulcrum around which their defence is built.
His impressive performance have seen him emerge on the radar of a number of top sides. Chelsea, Barcelona and Arsenal were all linked with a move earlier in the season, with 'RAI Sport' now reporting interest from Manchester United and Real Madrid as well.
However, the Italians are in no mood to see their star man leave on the cheap and are believed to have slapped a €120m price tag on his head in an attempt to ward off interest in him.
The Senegalese opted against leaving the club in January, despire their being no shortage of interest, with him instead declaring his love for the club.