Cricket South Africa said in a statement on Thursday he would appeal the decision, which prompted the ICC to respond before the second day's play in Adelaide.
"The ICC is disappointed that Faf du Plessis has chosen not to accept the findings of Match Referee Andy Pycroft and will instead exercise his right to appeal," the world governing body said in a statement.
"A Judicial Commissioner will now be appointed to hear the appeal at the earliest opportunity."
The 32-year-old, standing in for injured regular captain AB de Villiers, was charged after television footage showed him applying saliva to the ball while sucking on a sweet.
The ICC said on Friday the action breached the rules of cricket in relation to applying a foreign substance to the ball.
"The ICC understands that to include, but is not limited to, sunscreen, lip ice and residue from sweets," it said in the statement.
"The ICC does not wish to prevent players from using these substances for legitimate purposes, however, any deliberate attempt to apply such substances to the ball, as was the case here, will not be acceptable."
Du Plessis had earlier denied cheating and said he had been made a "scapegoat".
"I still completely disagree with (the verdict). I felt like I've done nothing wrong," he said before the third test.
"It's not like I was trying to cheat or anything, I was shining the ball. It's something that all cricketers do."
(Reporting by Greg Stutchbury in Wellington; Editing by Peter Rutherford)
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