The clash of the Caulfield Guineas and The Everest will see current Guineas favourite The Autumn Sun in need of a jockey change should the colt be directed towards the $2million feature at Caulfield.
Star hoop Kerrin McEvoy is locked into riding Redzel for Peter and Paul Snowden, the horse occupying the Yulong Investments slot in trying to go back-to-back in the richest race on turf.
That key booking for the $13million race would mean that The Autumn Sun, who launched to $3.20 favouritism at BetEasy for the Guineas off the back of a stunning Group 1 Golden Rose (1400m) win on Saturday, will have a new hoop on come October 13.
McEvoy - who has ridden The Autumn Sun four times for three wins and one runner-up finish - said on Sunday morning that while an unfortunate clash for him personally, leading trainer Chris Waller shouldn't have too many troubles finding a replacement.
"I haven't thought about that in regards to who rides him down there," McEvoy told RSN 927's Correct Weight.
"I'm sure Chris will have plenty of options, the phone will be ringing for sure.
"It's disappointing these two days meet on the same day, but it can't be helped. Connections understand when it comes to being there for Redzel in The Everest.
"It's such a big pay cheque; it's one you can't miss out on.
"At the same time, it's disappointing to forego the ride on him, being such a smart colt.
"It's going to be interesting to see who gets the ride down there in Melbourne."
The Autumn Sun and Kerrin McEvoy, picture Sportpix.com.au
Brenton Avdulla has won on the Autumn Sun, while a bevy of Sydney's top jockeys have ridden him at the trials.
McEvoy did hint though that The Autumn Sun was a pretty tractable type, after his last-to-first win in the Golden Rose at just start number five at Rosehill.
"He's a great colt to ride. He's got a good attitude. He's very laid back. He's only had five starts, but it's like he's been there before and done it," McEvoy added.
"He was very relaxed yesterday.
"Blinkers on yesterday had him travelling that little bit better over that shorter trip, and attitude goes a long way and this fella has it in spades, and definitely makes the job easier for the jockey, and I'm sure it makes Chris' job easier training him because he's such a cruisy fella to do anything with."
The dual Melbourne Cup-winning hoop, and two-time Caulfield Guineas winner, said The Autumn Sun certainly compares well to his previous Guineas-winning colts Helmet (2011) and Long John (2013).
"He's going to be one of the better ones I've ridden," he said.
"That doesn't mean he can go and beat Winx in a Cox Plate though! That remains to be seen if he lines up in the race this year. It wouldn't surprise me if he was there next year.
"There's many options for this horse going forward, but he's definitely one of the classiest three-year-old colts I've ridden.
"And I've ridden Helmet, Long John, and a fair few others that have been nice milers going forward in their careers.
"This fella is one of them for sure."