"I am not totally writing it off but I would say it is very unlikely he will be there," says Purdon. "He is going to be a long away behind our other horses as well as the other open class horses from other stables.
"For his first season in open class and his first Cup you would want a perfect build-up and a chance for him to get used to that grade.
"So I think he might miss the Cup carnival and while that would be disappointing it was never set in stone for him.
"Being a 4-year-old he has a lot of other options this season and will get his chance at the Cup next year."
Chase Auckland was clearly New Zealand's best 3-year-old pacer in the season just finished, emerging from maidens to win the Sires' Stakes, Sales Series Pace and the Northern Derby.
He was listed as the $10 fourth favourite for the NZ Cup last night, alongside last season's runner-up Jacks Legend and Interdom runner-up Chicago Bull.
The latter is looking more and more likely to became a rare West Australian-trained New Zealand Cup starter for a variety of reasons.
Not only is Chicago Bull back racing and winning effortless, admittedly in moderate fields, in Perth but the New Zealand Cup has already lost another big name in the injured Soho Tribeca and is looking a more attractive target by the day.
But perhaps most importantly Chicago Bull is being aimed at the Victoria Cup in Melbourne on October 13 and will therefore be halfway to Christchurch, and trainer Gary Hall is planning to send him to New Zealand soon after before heading back for the Inter Dominion, which starts at Melton on December 1.
While Chase Auckland is sidelined, a smaller than usual All Stars team left for Australia yesterday to contest the Breeders Crown on August 25.
Both Harness Jewels-winning juveniles Princess Tiffany and Another Masterpiece have been flown to Sydney where they will race at Menangle next Tuesday before heading south to Melbourne.
They have been joined by open class stablemate Cash N Flow, who faces a wide draw on his A$20,000 Menangle debut on Saturday night while the Regan Todd-trained Show Gait will travel with the All Stars team and also race next Tuesday before heading to Melton for the 3-year-old Breeders Crown Trot.