Napoli place £105m price tag on centre-back Kalidou Koulibaly in an attempt to deter Real Madrid, Chelsea and Manchester United

• Napoli have reportedly put a massive value on defender Kalidou Koulibaly
• Koulibaly has impressed during a three-year stint with the Serie A club 
• If asking price is met, Koulibaly would be the third most expensive player ever

Napoli have put a nine-figure price on in-demand defender Kalidou Koulibaly in a bid to deter transfer interest, according to reports in Italy.

Real Madrid, Chelsea and Manchester United are all said to be keen on the Senegal international centre back, who has impressed in Serie A.

Napoli, who will finish second behind Juventus after just falling short in the title race, are desperate to keep hold of Koulibaly.

They are so keen, they have placed an asking price of €120million (£105m) on his head, according to RAI Sport.

Koulibaly, 26, has been integral to Maurizio Sarri's team over the last three seasons since joining from Belgian club Genk for just £7m.

This has won him plenty of wealthy admirers, with Real, Chelsea and United all looking to strengthen their defences this summer.

Sarri has also been linked with the manager's job at Chelsea, and could look to bring Koulibaly with him to Stamford Bridge.

RAI Sport report that Sarri met with Napoli owner Aurelio De Laurentiis on Thursday, where one of the topics on discussion was Koulibaly's future.

If Napoli get their asking price for Koulibaly, it would make him the most expensive defender ever, easily outstripping the £75m Liverpool paid Southampton for Virgil van Dijk.

He would be the third most expensive signing ever, behind PSG's £198m acquisition of Neymar and Barcelona's £145m deal for Philippe Coutinho.