A dodgy knee has confined trainer Ross Stitt to barracks but there are no such problems with stable star Youthful Jack ahead of the July Sprint at Randwick.

The seven-year-old lived up to his name in the Ramornie at Grafton earlier this month, unleashing a devastating final burst to give Stitt one of his biggest thrills in racing despite his association with Group One winner Heavenly Glow.

Youthful Jack hasn't won in Sydney since February 2009 when he claimed the Royal Sovereign Stakes after Taree-based Stitt sent him to Allan Denham at Rosehill for an autumn campaign.

Stitt is recovering at home after undergoing a knee replacement last week but champion jockey Robert Thompson will once again be on the gelding's back.

"He sprinted like a three-year-old in the Ramornie," Stitt said.

"I've had some big moments in racing but that was one of the biggest.

"He has done very well since the Ramornie. I have been banned from the horses for two months but I've got good staff and they are looking after him and the other horses for me.

"All reports are he has come on from the Ramornie and he has to be better to win at Randwick.

"I don't get to see him at the moment but I will be watching on television, that's for sure."

Youthful Jack, who has won more than $1.1 million, is rated at 101 equal with See The World with Havana Rey the highest-rated horse in the July Sprint (1200m) at 104.

Stitt has no plans to retire Youthful Jack but admits he is getting harder to place with his high rating ruling him out of most country races.

He has spent the past two summers in Tasmania, winning four of his six starts there and another trip is among the options.

"We'll just see how he goes on Saturday whether we keep going in the winter with him," Stitt said.