Dual Group One winner Trust In A Gust will miss the spring as he undergoes surgery to remove a bone chip.

Trainer Darren Weir ordered extensive tests on the five-year-old after his disappointing first-up seventh in the Aurie's Star Handicap on August 8.

X-rays found a chip in a stifle that needs to be removed, not just for racing but his future career at stud.

Trust In A Gust underwent extensive tests after a mishap when being loaded on a plane to Brisbane in May, but was given the all-clear.

Weir said he was happy with Trust In A Gust leading up to the Aurie's Star but was disappointed with how the horse performed.

"We looked into it a bit more after the race and put him through a bone scan and unfortunately we found a hot spot," Weir told Melbourne radio station RSN.

"When they x-rayed the stifle area, in a different position to where they x-rayed it last time, they found a chip.

"Long-term it won't affect him."

Weir said Trust In A Gust wasn't showing any outwards signs of lameness.

He said it was only after the vets went right over him and fully tested the stifle area that he trotted up indifferently.

Weir said he has been in contact with Adam Sangster, who will stand the son of Keep The Faith at Swettenham Stud, about continuing his racing career into the autumn.

"Adam is very keen to do that," he said.

Weir said it was likely the five-year-old will undergo surgery later in the week or early next week.

Trust In A Gust has won 10 of his 19 starts including the Caulfield Group One double of the Sir Rupert Clarke Stakes and Toorak Handicap last spring.

His regular rider Brad Rawiller is also on the injured list with a torn adductor muscle after a mounting yard accident at Bendigo on Sunday.

Rawiller said he is expected to be sidelined for three weeks.