Javelin thrower Jarrod Bannister has used up two chances and could be kicked out of the London Olympics if he's guilty of one more breach of the Australian team's code of conduct.
Bannister on Thursday was fined $800 and had his licence suspended for three months after pleading guilty to drink-driving as well as driving unlicensed, unregistered and uninsured.
The February incident in Brisbane prompted Athletics Australia (AA) to slap him with a three-month ban from all competition, suspended for 12 months as long as he stayed out of trouble.
The Australian Olympic Committee (AOC) agreed the Commonwealth champion could compete if he remained trouble-free.
This came months after Bannister, 27, lost his scholarship with the Victorian Institute of Sport for breaching its code of conduct in a separate incident which was believed to have involved funding.
"Any further indiscretion will result in a suspension," AA spokesman Cody Lynch told AAP on Thursday.
"That's quite a clear warning where he's at."
Australia's chef de mission Nick Green has warned Bannister, who came seventh at last year's world titles, to behave.
"The AOC selection committee looked at the individual circumstances of the case and decided to issue a warning to Jarrod Bannister," Green said.
"He has escaped a sanction on this occasion."
Bannister's sentence in the Brisbane Magistrate's Court comes days after cyclists Jack Bobridge and Michael Hepburn were involved in a drink-driving incident in Spain.
A Spanish court fined Bobridge 700 euros ($A880) and his licence was suspended for eight months after a minor collision in a car park in Girona.
Cycling Australia found Bobridge and Hepburn guilty of misconduct, but they will stay in the Games team.
Swimmers Nick D'Arcy and Kenrick Monk have been told they must leave London as soon as their competition has finished after posting photos of themselves with high-powered guns at a US rifle range which breached the team's social media policy.
D'Arcy was kicked out of the Beijing Games team in 2008 for assaulting fellow swimmer Simon Cowley, while Monk was lucky to avoid charges last year after lying to police that he had been the victim of a hit and run accident when he had actually fallen off his skateboard.
The court on Thursday heard Bannister had a couple of glasses of wine and went out to buy ice cream when he was pulled over with a blood-alcohol reading of 0.057.
"I deeply regret what I did and I'm going to put this behind me now and focus on London," Bannister told reporters outside the court.
He had just moved to Queensland, the court heard, and had not renewed his licence.
Magistrate Bronwyn Springer did not record a conviction, saying she understood the difficulties that could cause during Bannister's travel to the Olympics.