Schappose - a nine-year-old galloper - could instead head to Twin Hills on Friday as Cook attempts to qualify him for the Country Cups Challenge Final at Doomben in December.
“If he runs at Mackay he’ll race well but I may have to take him to Twin Hills as I’m trying to qualifying him for the Country Cups Challenge Final in Brisbane,” Cook said.
Schappose was successful at Mackay in early May but has been mixing his form since with one placing from his past three starts.
The son of High Chaparral led into the straight before he compounded to tail a field of eight over 1560 metres at Mackay last start.
Cook rates the Manzelmann-trained Invincible Jet as the main threat to his pair.
“Invincible Jet is a moral at the weights being only a half-a-kilogram above the minimum,” Cook said.
Invincible Jet has hit a purple patch of form winning two of his past three starts including a last-start triumph in a 1250 metre Benchmark race at Cairns on September 8.