African Cup of Nations host country, Cameroon is the latest to announce several coronavirus cases in their camp.
The Indomitable Lions face Burkina Faso in the first game of the tournament on 9 January.
The Cameroon Football Federation said Pierre Kunde Malong, Jean Efala, Michael Ngadeu Ngadjui and Christian Bassogog had been under observation since Wednesday because of “strong suspicions” they had the virus, and the quartet will continue to quarantine.
Fellow Group A contenders Cape Verde have had seven players including all three goalkeepers and an assistant coach test positive.
Holders Algeria and Ivory Coast have also reported cases at their training camps in Qatar and Saudi Arabia respectively.
Meanwhile, Cameroon forward Eric Maxim Choupo-Moting has suffered an injury scare and the hosts are the latest to announce several coronavirus cases.
Choupo-Moting, 32, is awaiting the results of a scan after he left a training session early because of a knee issue.
