As speculation intensifies about John O'Shea being Darley Australia's next head trainer, it is business as usual for the Randwick-based horseman.

O'Shea declined to comment on reports he was the front-runner to replace Peter Snowden at the helm of Darley's racing operation, confirming only that he would consider the role if approached.

He was more forthcoming discussing his two runners at Randwick on Saturday, headed by in-form stayer Tenacitus.

A winner of his past three starts, Tenacitus will step up quickly in trip from an 1800-metre win last Friday to the 2500 metres of the Goldners Horse Transport Handicap.

It's a scenario O'Shea is comfortable with, given Tenacitus' fitness foundation.

"He's had two runs, one at 1800 and one at 1900 and he's having a back-up. Obviously, it's a bit of a risk but he's a very fit racehorse," O'Shea said.

Tenacitus has a pedigree that would be foreign to a lot of Australian racing followers.

He is by American stallion Rock Hard Ten, who was placed in the Preakness Stakes and Santa Anita Derby.

His dam is by American thoroughbred Hall of Famer Manila who excelled over longer distances.

Those bloodlines have been a reference point for O'Shea who expects Tenacitus to revel in a distance rise at Randwick.

"If you have a look at his pedigree it will probably play into his hands," O'Shea said.

"It looks very stout."

Carmine King will resume for the O'Shea stable in the International Animal Health Handicap (1150m) after a barrier trial win.

Scratched from Rosehill last Saturday because of a wide gate and big weight, Carmine King is being aimed towards next month's Magic Millions carnival on the Gold Coast.