Connections of Bago have already walked Lone Star's dirt track ahead of his planned tilt at the Classic, while Cacique, Whipper and last year's winner Six Perfections are pencilled in for a tilt at the Mile.
Dunlop's plans could have important consequences for Kieren Fallon, who is desperate to fend off Frankie Dettori in their ongoing jockeys' title battle but could miss a crucial weekend at the end of this month if asked to ride Ouija Board in America.
Meanwhile, Fallon also faces a stressful November.
The current champion will learn whether City of London Police plan to charge him over his arrest into an investigation into alleged race-fixing on 2 November, while the Jockey Club have denied suggestions that disrepute charges levelled against Fallon and John Egan in the wake of a News of the World sting operation are about to be dropped..
Portman Square PR director John Maxse said: "Our intention is still to go ahead with a hearing to establish whether they were culpable for damaging the public image of racing and November remains the target.
"There has been no substantial progress on some of the other cases pending, though we hope to accelerate the procedure over the next week or so."
Breeders' Cup Classic (William Hill): 9-4 Pleasantly Perfect, 11-2 Bago, 6 Birdstone, Ghostzapper, 7 Roses In May, 12 Saint Liam, 16 Funny Cide, Victory Moon, 20 bar.
