Tag: Kalidou Koulibaly: Chelsea sign Senegal defender from Napoli on four-year deal

    Chelsea have signed centre-back Kalidou Koulibaly on a four-year deal from Serie A side Napoli. The Senegal international, 31, joined Napoli from Genk in 2014 and made 317 appearances for the Italian side.   His arrival at Stamford Bridge follows the departures of defenders Antonio Rudiger to Real Madrid and Andreas Christensen to…