Napoli defender Kalidou Koulibaly is attracting interest from Europe's biggest clubs.
Koulibaly has been a revelation this Serie A season, having only arrived in the summer from RacingGenk.
Corriere del Mezzogiorno says Bayern Munich, Manchester United, Chelsea and Real Madrid have all posted scouts to check on the 23 year-old in recent weeks.
Napoli splashed out €8 million to sign Koulibaly three months ago and now rate him at least double that figure.
For his part, Koulibaly insists: "I've very happy here.
"I've learned a lot since I've come here, I garnered experience in this team. I did not expect to be first-choice so quickly."
