Koroibete isn't the complete package but trainer Gerald Ryan believes he will be when the autumn comes around.

The three-year-old beat older horses over 1800m at Randwick on Saturday after again showing his dislike for going into the barrier stall.

But once out of the gate, the $3.30 favourite raced tractably midfield and overhauled the leaders in the straight to beat Rule Book ($26) by 1-1/4 lengths.

"He is the best horse I've brought to the races for a long time," Ryan said.

"Once I can curb his brain he'll be right.

"He will go for a break now for about three weeks and then when he comes back we will set him for the Rosehill Guineas and then decide on the Derby after that.

"He is going to be a very good stayer."

Koroibete has now won three of his six starts and been placed in the other three.

After his two-year-old season he was gelded and at three he has been fitted with a barrier blanket.

He also had a clerk of the course on either side on Saturday to get him in the barriers.

Stewards warned Ryan the horse's reluctance to load could have consequences but the trainer said he was sure he could iron them out.

Koroibete is owned by a group which includes West Tigers captain Robbie Farah and is named after winger Marika Koroibete.

He is by little-known stallion Kheleyf who stood one season in Australia at Darley.

"As soon as I saw him I knew he would be a stayer even though everyone told me he was bred to be a sprinter," Ryan said.

"Now he's a gelding he has a long future in staying races."