CAF are stepping up their testing of players at age group levels in order to expose those turning out in the wrong age groups.
Uganda took a step closer to the second qualifying round as they moved top of group J with a 2-1 win over Angola in their World Cup qualifier.
Uganda will be looking to claim top spot in Group J when they meet Angola in 2014 World Cup qualifying action on Saturday.
A 91st minute goal from Heldon proved decisive as Cape Verde defeated Angola 2-1 to book their place in the quarter-finals of AFCON 2013.
The African Cup debutants Cape Verde have not disgraced themselves but Angola, the 2010 African Cup of Nations hosts, have disappointed.
South Africa and Angola will both be out for a first win at AFCON 2013 when the second round of Group A matches take place on Wednesday.
The opening round of Group A matches proved fruitless as Angola and Morocco draw 0-0 at the National Stadium on Saturday.
Angola take on Morocco in the second match of the Africa Cup of Nations at the National Stadium in Johannesburg on Saturday night.
Orlando Pirates kick off their 2012 African Champions League campaign against Angolan champions Clube Recreativo Desportivo do Libolo.
A brace from Wilfried Bony secured Ivory Coast top spot in Group B and sent Angola crashing out of the Africa Cup of Nations on Monday.
Sudan twice came from behind to earn a 2-2 draw with Angola in an AFCON group B clash at Nuevo Estadio de Malabo on Thursday night.
Sudan will look to claim their first points of the 2012 AFCON when they face an in-form Angola side in Group B action on Thursday.
Manucho's 68th minute winner helped Angola defeat Burkina Faso 2-1 in their AFCON Group B opener in Malabo on Sunday night.
Burkina Faso and Angola get their Africa Cup of Nations campaigns up and running on Sunday when they clash in their Group B opener.