The fate of Smith, Warner and Cameron Bancroft is expected to be become clear in the early hours of Wednesday morning (NZT).
The ICC didn't ban Bancroft, instead punishing his ball-tampering charge with a hefty fine and three demerit points, but CA may not be so forgiving.
Related stories:
• World reacts to Steve Smith's decision to step down as captain in Cape Town
• A national day of shame': How Australia reacted to ball-tampering scandal
• Cricket ball-tampering: How it works, why players do it and what are the punishments?
• The Aussie cheating crisis
• 6 Questions from cricket's ugly ball tampering bombshell
• The steep descent of Australian captain Steve Smith bombshell
• This is worse than 'mintgate' says SA skipper
• Dylan Cleaver on cricket's ball-tampering scandal: Having the (tampered) balls to take on Australia
• The hits keep coming for Steve Smith and co
• Former Black Caps opener Mark Richardson admits to ball tampering during cricket career
• Ball-tampering scandal: Cricket's Cheats XI
• Cricket world mercilessly mocks the Australian team
• Young South Africa fan offers sandpaper to Australian player
Bancroft carried out the plan on Saturday then attempted to hide the evidence from umpires, while Warner was also involved in the initial discussion.
Any player or member of support staff who conspired to use sticky tape in an illegal effort to scuff the ball at Newlands are also likely to be sanctioned.
CA has the power to mete out lifetime bans from the sport but the governing body is unlikely to opt for such an extreme response.
Australian Cricketers' Association (ACA) chief Alistair Nicholson is on deck in Cape Town, where a series of crisis talks are unfolding.
Not since the "homeworkgate" saga of 2013, when Shane Watson was banned, flew home, copped criticism from Howard then returned to India and became Australia's 44th Test captain, has there been such instability in Australian cricket.
On that occasion, four players were given one-Test suspensions for not completing written feedback to then coach Mickey Arthur.
Now, Smith has admitted he rubber-stamped ball tampering. The fresh-faced leader's moral compass was corrupted by a desperation to win.
Tim Paine, who is set to lead Australia in the fourth Test, says Smith and Bancroft are "struggling" as the full extent of the backlash becomes clear.
"They're not great. It's been a horrible 24 hours, they're struggling but probably the reality and the enormity of what's happened is starting to sink in," Paine said after his team's 322-run loss at Newlands.
"I don't think we all would have expected this to be as big as it has been and particularly the fallout that we have seen from back home."
Paine is expected to formally become Australia's 46th Test captain, having filled in when Smith and Warner stood down from their leadership roles for the rest of the third Test on Sunday.
The Tasmanian wouldn't be drawn on whether Smith and coach Darren Lehmann should continue in their posts.
Paine also wouldn't entertain the prospect of replacing Smith in a full-time capacity.
"There'll be a review this week. I'm not sure what's going to happen," he said.
"I don't think anyone is."