Trainer Clinton McDonald is hoping for a change of fortune with the barriers in the Caulfield Guineas Prelude to give Revolving Door his chance to prove he is a genuine Guineas contender.

Revolving Door has drawn awkwardly in his past two starts and as a result has had to come from back in the field as the widest runner.

McDonald says the colt will be able to race closer if he draws a good barrier for Saturday's Guineas Prelude (1400m) at Caulfield.

Revolving Door finished sixth, beaten 2-1/2 lengths behind Detective in a Listed 1400m race at Flemington last start against a number of other Guineas hopefuls.

"His sectionals the other day were good from the 800 metre mark to the furlong (200m) and then his run probably petered out a bit," McDonald said.

"But he's come on. He's had a bit more work pumped into him and he's responded well to the extra pressure. So we just need to draw a marble.

"If we draw a good barrier he's going to be able to race a lot closer to the speed. He's got a really good turn of foot I think for about three hundred metres and then it plateaus out a bit.

"So if he can get that suck run and travel up a bit closer with a better barrier, hopefully we'll see a bit of a different horse."

Second acceptances for the Caulfield Guineas were taken on Tuesday with 48 three-year-olds in contention but former favourite Astern was not among them.

McDonald expects the Guineas Prelude to be telling.

"We feel he's been in good form, he's just had a bit of bad luck here or there," he said.

"Saturday will really tell the tale of whether he's a genuine Guineas horse or whether we have to lower our sights."