Attendances at the Africa Cup of Nations will be capped at 80% of capacity for games involving hosts Cameroon, and 60% for all other matches at the tournament.
The move by organisers Confederation of African Football (Caf) comes following consultation with the Cameroon government regarding the ongoing coronavirus pandemic.
Spectators must be fully vaccinated and present a negative test result in order to attend games.
Just 2% of people in Cameroon have had both vaccination jabs, according to figures from Our World in Data, but reports indicate there has been an increase in the number of people in the country trying to get vaccinated so they can buy tickets for the competition.
“Caf will continue to monitor the situation and the evolution of the health conditions and adapt measures if needs be,” said a statement from African football’s governing body.
Cameroon open the tournament against Burkina Faso at the Olembe Stadium in Yaounde, which has a capacity of 60,000, on Sunday.