Both players were withdrawn from the squad as they are suffering from chicken pox (Coetzee) and a hamstring injury (Nxumalo).
South Africa faces Mauritania in their final 2017 Gabon Africa Cup of Nations qualifiers on Friday, 2 September at the Mbombela Stadium in Nelspruit.
Four days later (Tuesday, 6 September) Bafana Bafana will be back on the field to host Egypt in the 22nd edition of the Nelson Mandela Challenge.
This will take place at Orlando Stadium in Soweto.
Both matches kick off at 19h05.
Bafana Bafana have already assembled for camp and preparations will start in earnest in Nelspruit on Tuesday, 30 August when the team trains at the Kanyamazane Stadium at 10h00.
Tickets for the two matches are already on sale and can be purchased at Computicket, Shoprite and Checkers countrywide.
Tickets for the Mbombela clash are R50, while to watch the 2016 Nelson Mandela Challenge will cost you R80 all-round.
South Africa’s 2017 AFCON:
South Africa 0 - 0 Gambia June 2015
Mauritania 3 - 1 South Africa September 2015
Cameroon 2 - 2 South Africa March 2016
South Africa 0 - 0 Cameroon March 2016
Gambia 1 - 4 South Africa June 2016
South Africa vs Mauritania 2 September 2016