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Top Premier League clubs look set to battle it out for Napoli stopper Kalidou Koulibaly this summer.
Senegal international Koulibaly has impressed during four years in Italy.
Potential suitors in the 26-year-old include both Chelsea and Arsenal.
Interested clubs are likely to bid early rather than risk his value rocketing in Russia at the World Cup this summer.
Koulibaly was in the French second tier at Metz before he moved to Genk in 2012 under Janssen’s recommendation.