But he needs to gather significant black-type form in Australia to increase his value as a potential sire and Marsh is hoping he can do that at the top level next start.
"At this stage, we're just concentrating on the Canterbury Stakes and we'll see after that whether he has another run in Sydney," Marsh said.
Ardrossan's racing career has been resurrected since he was sent to Melbourne last year and a series of problems prevented him showing his real form in three starts.
His comeback run for Marsh was a winning one at Te Aroha when beating Dama Zorro, who subsequently won the final race at Te Rapa on Saturday.
Marsh enjoyed more success at Te Rapa, with Miss Rippy taking out the SVS Hamilton Premier (2100m). He also gave Crown Prosecutor, winner of the group three Wellington Stakes (1600m), a lead-up to the group one Vodafone New Zealand Derby (2400m) next month.
Crown Prosecutor finished ninth in the group two Waikato Guineas (2000m), 6 lengths from the winner, Sponge Bob.
"He'll go straight to the Derby now," Marsh said. "He'll be ridden a lot more forward in the Derby to use his speed. He just got too far back on Saturday."
Marsh's other New Zealand Derby prospect is Vernanme, who will be on trial for the feature when tackling the group two Avondale Guineas (2100m) at Ellerslie on Saturday.
The son of O'Reilly is a one-race winner, but justified his Derby nomination when second equal behind Madison County in the group one Levin Classic (1600m) at Trentham last start.
"He's flying at present," Marsh said. "He went a top race last start and the distance will suit him on Saturday. Jason Waddell will ride him in that and also the Derby."
Waddell won last year's New Zealand Derby on Vin De Dance after finishing third on him in the Avondale Guineas.
- NZ Racing Desk