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#6 Kalidou Koulibaly (Napoli)
Kalidou Koulibaly is a 27-year-old centre-back who currently plays for Napoli in Serie A. He has also represented Senegal 32 times since making his debut in September 2015. Koulibaly did initially play for France's U20 team but ultimately decided to go with Senegal after four years with the former side.
Koulibaly is easily Napoli's best defender and is arguably one of the best in the world right now, hence interest from the likes of Manchester United, Chelsea, Real Madrid and Barcelona. He has featured in 26 matches for Napoli so far this season and kept clean sheets in 13 of them (50%).
Barcelona are right to be interested in the Senegalese giant, as he'd be a complete rock at the back, potentially replacing the ageing Gerard Pique to work alongside Samuel Umtiti.
The only thing that might put them off, though, is Koulibaly's £65m price tag. It's a lot of money to spend on one player, but with all he's proven so far for Napoli, it could be a gamble worth taking.
