Darren Lehmann on Thursday announced the fourth Test against South Africa will be his last game as Australia's head coach, according to a report on Cricket Australia website. Lehmann was speaking at the pre-match press conference ahead of the fourth Test against South Africa beginning Friday. After being cleared of any wrongdoing by Cricket Australia (CA) investigation in the ball-tampering scandal on Wednesday, Lehmann said he fears for the health of Steve Smith, David Warner and Cameron Bancroft. Lehmann comments came after CA slapped one-year bans on Smith and Warner besides announcing a 9-month ban on the 25-year-old opener Bancroft for their involvement in tampering with the cricket ball during the Newlands Test against South Africa.