The Premier League sides will have to part with £88m to land highly-rated Napoli central defender Kalidou Koulibaly.
Napoli’s centre-back is a target for several Premier League teams including Arsenal, Manchester United and Chelsea.
The Blues are in the transfer market for a central defender as David Luiz could depart from the club and Gary Cahill turns 33 in December.
The Gunners are in a similarly dangerous position defensively, with France international Laurent Koscielny until the end of the year after fracturing his Achilles earlier this month.
Senegal international Kalidou is aerially strong and should adapt to the EPL with relative ease if Koulibaly made the move.
But his Serie A side – who finished second behind Juventus in Serie A current season – have issued a hands-off warning to the English teams.
According to Radio Kiss Kiss, the club’s sporting director Cristiano Giuntoli will only consider a big offer.
Should the Italian giants achieve their desire transfer sum, it would represent a mammoth profit on the £6.8m Napoli shelled out to bring Senegalese player in from Belgium side Genk four years ago.