O'Brien said: "The Australian people are coming over to check them in the next few days. They are all getting scanned over the next while and then they check them, but very few horses pass the criteria, especially young horses. It's very difficult for three-year-olds to get through because they are still growing and their bones are still maturing so I wouldn't be sure about any of them getting in and being allowed to run. It's ridiculous really."
He added: "Because they are three-year-olds, they are not as formed as older horses, and there will be things that show up in their scans, but they are not prepared to forgive anything. The same horse who scans wrong this year could scan perfect next year because they are only three turning four and have yet to fully develop. But we're only guests down there in Australia and we play under their rules and that's just the way it is."