Heavyweight jockey Ashley Butler has been retained to partner the eight-year-old in the 1400 metre feature.
“It was a big effort from him in the Cleveland Bay last week and for a while I thought he was home,” Hansen said.
“But, the winner, Isis Carmella, got the right run at the right time and beat us fair and square.
“He’s in great form this year and he won the Mackay Newmarket two runs back in race record time.”
Doctor Zous won the Cairns Newmarket in 2021 after finishing second to Master Jamie in the Cleveland Bay Handicap in Townsville that year.
He followed the same path last year finishing second to Wren’s Day in the Cleveland Bay before finishing fifth to his stable mate Bombasay in the Cairns Newmarket.
“I’ve won most of the big races up north except for the Cleveland Bay and hopefully I can win the Newmarket again on Saturday,” Hansen said.