Napoli defenders Kalidou Koulibaly and Faouzi Ghoulam have both tested positive for coronavirus, the Serie A club confirmed on Friday.
Kalidou Koulibaly scored an own goal in the second minute of stoppage time to hand Juventus the three points in Turin.
Algeria clinched their first Africa Cup of Nations title in 29 years, and the country's first on foreign soil, having lifted the trophy as hosts in 1990.
Arsenal saw off highly-fancied Napoli 2-0 at the Emirates, while Marco Alonso's late header earned Chelsea a hard-fought win at Slavia Prague.
