Riven Light's Australian adventure is over after he suffered an injury at Caulfield on Saturday.
Willie Mullins' dual-purpose performer had finished seventh of 11 in the Group One Ladbrokes Stakes, beaten less than five lengths, and had been entered in the Cox Plate.
But Mullins told the Irish Independent: "He's fractured an off-fore joint and it's a premature end to his Australian journey.
"I knew there was something wrong as when he was pulled out by the rider, he weakened quickly, having been holding his position easily.
"Perhaps he was feeling the ground. He was travelling very well and when he was pulled out, he seemed to get the injury.
"We'll see about his future - it is going to require screws, it is going to require an operation."