Bans for Steve Smith, David Warner and Cameron Bancroft over the ball-tampering incident are "disproportionate", the organisation representing Australia's cricketers has said.

Former captain Smith and ex-vice-captain Warner were suspended for 12 months and Bancroft received a nine-month ban for their roles in using sandpaper on the ball during the third Test against South Africa.

On Tuesday, the Australian Cricketers' Association (ACA) called on Cricket Australia (CA) to reconsider the sanctions imposed on the players, saying they did not follow precedent for the type of offence.