AUSTRALIAN Test bad boys Steve Smith, David Warner and Cameron Bancroft will be sent home from South Africa, with "significant sanctions" set to revealed in the next 24 hours.

Cricket Australia boss James Sutherland revealed that the captain, vice-captain and ball-tamperer Bancroft were the masterminds behind the Third test plot.

Sutherland refused to answer whether Smith will captain Australia again, if Warner would play again or whether the players "cheated".

He also declared that coach Darren Lehmann was not involved and would coach on, refuting that he had offered his resignation.

Sutherland promised that "significant punishments" were imminent, but CA were not yet in a position to make a verdict.

Matt Renshaw, Glenn Maxwell and Joe Burns have been drafted into the squad for the fourth Test starting Friday, with Tim Payne set to captain the side in Johannesburg.

A nervous Sutherland hinted at lengthy bans during a press conference at his Johannesburg hotel.

FOLLOW OUR COVERAGE OF SUTHERLAND'S PRESS CONFERENCE AND REACTION