Football's world governing body FIFA has warned South Africa following their use of more than six substitutes during their 2-0 international friendly win against Tunisia on Wednesday, according to Reuters.
FIFA confirmed that they had sent the South African Football Association a letter on Friday to remind them of the change in laws regarding the amount of substitutes used in a match.
South Africa has been warned that future violations of the new rule could force FIFA to sanction Bafana Bafana, after they used seven substitutes in Tunis.
Bafana coach Stuart Baxter is said to have been experimenting with his side ahead of next month's World Cup qualifier against the Democratic Republic of Congo in Kinshasa on September 5.
The new rules, which came into effect on July 1, state that no more than six substitutes may be used in friendly matches.
The rule was changed and implemented after FIFA president Sepp Blatter said unrestricted substitutions were turning friendly matches into farces, following the outcry after national coaches such as England's Sven-Goran Eriksson and Luis Felipe Scolari of Portugal changed their entire starting line-ups during the course of a match.