The masks were brought into the ground by some spectators as a way of trying to ridicule Warner, whose wife Candice had a well-known encounter with Williams in 2007, years before she met the Australian vice-captain.
After an ugly feud with South African keeper-bat Quinton de Kock during the first Test in Durban last week, Warner has reason to be aggrieved during the ongoing second Test too.
Cricket Australia effectively told the aggressive opener he was on his final chance in 2013 after a bar-room scuffle with Joe Root.
The presence of the Williams' masks are made all the worse considering Candice and Warners' two children are believed to be in attendance at the Test match.
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While the songs were not heard at St George's Park, the masks were seen but only after CSA officials had to intervene to allow mask-wearing fans into the stadium.
While CSA respects the rights of its fans to represent their own points of view, CSA does not associate itself with these actions and urges all Protea supporters from refraining from being involved in distasteful or unwelcome actions that may impact the image of the sport and its supporters.
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CSA said Eksteen and Kazi were now subject to "internal processes".
David Warner's tumultuous tour of South Africa has gotten more dramatic, with the South Africans accusing him of cheating according to The Australian. The Australian team and its management are understandably enraged.
Warner credits Candice for turning his life around.
The allegations are the latest development in what has been a fractious series. Incensed by disparaging remarks made by de Kock about his wife Candice, the vice-captain had to be held back by teammates on his way up the stairwell to the team dressing room. Australia's Nathan Lyon also was punished for an over-zealous celebration of a wicket in that first test.
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Conte could call upon the Belgium playmaker to fill the role on Wednesday or opt to use either Olivier Giroud or Alvaro Morata as a more conventional striker.