The ball-tampering incident took place during the Saturday afternoon session in Cape Town and was picked up by TV cameras.
A small, yellow object was seen in batsman Cameron Bancroft’s hands after he had worked on the ball, the opener later revealing it to be a piece of tape covered in dirt.
He was later captured taking it from his pocket and placing it down his trousers, a few moments after being spoken to by the substitute Peter Handscomb, who had come onto the field after speaking to coach Darren Lehmann via walkie-talkie.
Although the two on-field umpires, Richard Illingworth and Nigel Llong of England, questioned Bancroft at the time, he produced what appeared to be a black sunglasses bag from his right pocket in way of explanation, in a bid to deceive the officials.
‘Once I was sighted on the big screens I panicked quite a lot and that resulted in me shoving it down my trousers,’ said Bancroft.
No action was taken at the time — the umpires could have changed the ball or docked Australia runs — but match officials, including referee Andy Pycroft of Zimbabwe, were able to review TV footage of the incident.
But after the day’s play, captain Steve Smith and Bancroft admitted the ball-tampering in a press conference.
Bancroft revealed: ‘We had a discussion during the (lunch) break and I saw an opportunity to use some tape, get some granules from the rough patches on the wickets and change the condition — it didn’t work, the umpires didn’t change the ball.’
Bancroft and Steve Smith admitted that ball tampering had taken place during the action
Smith continued: ‘It was a poor choice and we deeply regret our actions. The coaches weren’t involved. It was purely the leadership group who came up with this.
‘We saw this game as such an important game. We’ve seen the ball reversing through this series and this ball didn’t seem like it was going to go. It’s such poor actions. Deeply regrettable.’
Smith and vice-captain David Warner were sacked from their positions before play on Sunday. Bancroft was fined 75 per cent of his match fee.