Hong Kong based Zac Purton was called before stewards to explain his ride on Japanese stayer Fame Game in the Caulfield Cup.
Racing Victoria stewards had concerns over Purton's ride from the 800m mark of Saturday's race and his alleged lack of vigour over the final 100m.
Stewards, through an interpreter, questioned Fame Game's trainer Yoshitada Munakata over his instructions to Purton.
Munakata told stewards instructions given were from barrier one to get back, not to go too wide and to ride between horses.
"This horse tries harder between horses," Munakata said.
He said the horse had travelled from Japan to win both the Caulfield and Melbourne Cups.
He told stewards he was happy with Purton's ride after expecting the field to spread out.
Purton told stewards he was taking runs as they presented but was being buffeted by horses.
Asked if he could have moved off the fence earlier, Purton said he would have been pushed wide on the hometurn which was contrary to instructions.
"That's why it's called ride for luck," Purton said.
"I've won a lot of races riding for luck."
Stewards told Munakata the instructions had given them some concern and they would expect Fame Game to be ridden in a similar manner in the Melbourne Cup.
Purton was told they believed he should have attempted to improve earlier than he did and that they had concerns over the way he rode Fame Game out over the last 100m.
Damien Lane was suspended for 10 meetings after causing interference aboard Rising Romance rounding the hometurn in the Caulfield Cup, that resulted in Magicool being checked.
Dwayne Dunn will consider appealing a 10-meeting suspension that will cost him the ride on Chautauqua in the Manikato Stakes on Friday night and Happy Trails in the Cox Plate.
He was suspended on a careless riding charge aboard the dead-heater Lumosty in the Caulfield Sprint.
Glyn Schofield was also suspended out of that race aboard Ball Of Muscle and outed for 10 meetings.