Laing said he phoned Bowman and his manager on Sunday offering the ride and after studying recent replays, they decided to take up the offer.
“They thought looking at his runs he was a horse on the way up while some of the others might have already hit their peaks,” Laing said.
Laing was happy with the way Stars Of Carrum hit the line in the Mornington Cup (2400m) when beaten just under two lengths.
Stars Of Carrum lost his position at the 800m-mark before being held up behind horses near the home turn.
“He's run home his last 200 metres in 11.5 seconds and his last 50 metres was his strongest,” Laing said.
“I'm the happiest I've been with him for the whole preparation and I'm looking forward to the Derby.”
Saturday's Mornington Cup was Stars Of Carrum's fifth run this campaign and Laing said he would be at his fittest in the Australian Derby.