English stayer Forgotten Voice is being treated for travel sickness at the Werribee quarantine centre.
Racing Victoria said Forgotten Voice had been treated on Monday, the day after he arrived in Australia, and he was expected to make a full recovery with little disruption to his plans for the Caulfield and Melbourne Cups.
The Nicky Henderson-trained stayer is a last-start winner of the Group Three Glorious Stakes (2400m) at Goodwood in August.
He is one of nine horses that flew into Melbourne over the weekend to join Hong Kong sprint star Lucky Nine in two weeks post-arrival quarantine.