Napoli centre-back Kalidou Koulibaly has tested positive for COVID-19 while on international duty with Senegal at the Africa Cup of Nations in Cameroon, the Serie A club said on Saturday. Senegal was scheduled to depart Dakar on Wednesday but the trip was delayed for re-testing of the squad after positive cases for midfielders Pape Matar Sarr and Nampalys Mendy and …