Perth trainer Adam Durrant has been fined $10,000 after being found guilty of planning to administer a raceday treatment to Mr Moet before he ran at Caulfield on Saturday.
Durrant said he was not guilty and was likely to appeal the decision, telling Racing Victoria stewards during Tuesday's inquiry he believed he would "get off quite easily".
"I feel I've got a pretty strong case," Durrant said.
He said he was preparing the treatment so his stablehand could give it to the horse after he had raced and returned to the stable.
Stewards charged Durrant with conduct which "could have led to a breach of the rules" following a stable raid by the Compliance Assurance Team (CAT) at the stables which housed Mr Moet on the morning of the Caulfield meeting.
He was charged after evidence from CAT officers who said they found him approaching the stall of Mr Moet "with a loaded syringe of Carbalene" and a hand towel.
The CAT also produced a video of their visit to the stable.
CAT member Dion Villella said when he entered the stables where Durrant had Mr Moet stabled, he witnessed Durrant with a syringe in his hand.
Stewards said they were satisfied the trainer was intending to administer the alkalising agent to Mr Moet before he went to the races against the rules.
The trainer told stewards there was no evidence to say he was going to the horse's box to treat him.
"I'm not guilty of doing anything but being organised for my worker," he said.
Mr Moet raced in Saturday's Group Two Peter Young Stakes where he finished second.
Durrant is the fifth trainer to be fined $10,000 since crackdowns by Victorian officials began during the spring carnival.
Mr Moet is the second favourite behind 2012 Melbourne Cup winner Green Moon for the Australian Cup on Saturday week.