At least three Hong Kong-based jockeys take to the air for Group One assignments in both hemispheres this weekend, although Zac Purton revealed serious doubts about his prospects of making it two Caulfield Cups in succession on Fame Game.

The Japanese stayer was made betting favourite for both the 2,400m Caulfield Cup and Melbourne Cup over 3,200m after the announcement that Purton would ride him.

But, in the past 10 days, he has been deposed by Godolphin's Hauraki after his Craven Plate second at Randwick and now by Mongolian Khan, following his slashing lead-up at Caulfield last weekend.

Twelve months ago, Purton flew to Melbourne to gallop Japanese-trained Admire Rakti leading up to his Caulfield Cup win and came away excited about his prospects, but was not exuding the same confidence after working Fame Game yesterday morning.

"I think the 2,400m is going to be too short for him, especially after the feel he gave me this morning. Unless they go a ridiculous pace, I can't see him getting that warm," was the Australian's summary. "When I galloped Admire Rakti, I got off him and thought he was a real chance to win - he was sharp around the turns, handled the track well and gave me a really good feel.

"Fame Game gave me a really good feel, too, but he didn't corner as well and he's more dour and feels more like a real stayer. The bigger track and longer distance of the Melbourne Cup at Flemington will suit him more. And his body weight's up a bit right now - after this gallop and the Caulfield Cup, he should be primed at Flemington."

WATCH: Zac Purton's Caulfield Cup and Melbourne Cup mount Fame Game finishes second to Gold Ship in the Tenno Sho (Spring) in May

Only a few days since announcing an official review of the club's policies surrounding such flying Group One raids, after Purton and Joao Moreira were unable to ride at Sha Tin on October 4 when typhoon winds prevented their plane from landing in Hong Kong, the club granted permission yesterday for Purton and Chad Schofield to ride in the Caulfield Cup.

Schofield rides Australian Oaks winner Gust Of Wind.

A third permission for Caulfield may be issued today for Moreira as well but he is still awaiting news on whether Godolphin will have a second runner in the final field when it is declared this morning. James McDonald rides Hauraki unless stablemate Complacent, currently just outside the top 18 in the order, gains a start, in which event McDonald will ride Complacent and Moreira will reunite with Hauraki.

Heading in a different direction but with similar aims is Gerald Mosse, who rides Kodi Bear in the Group One Queen Elizabeth II Stakes at Ascot on Saturday before starting a three-meeting careless riding suspension.

The Jockey Club formally cleared Mosse yesterday as well, although his status differs slightly in that he is a stable-retained jockey.

Closer to home, jockey Eddy Lai Wai-ming injured his right leg in a barrier incident at trackwork yesterday and has been stood down from his two rides at Happy Valley tomorrow night.

Schofield goes onto Groovy in race three, while Richard Fourie takes the ride on Kim Glory in the fifth race.