The Ballydoyle pair finished first and second in the Irish Derby and look set to lock horns with the first two home from Chantilly with runner-up Bubble Chic an 11/2 chance.
David Williams of Ladbrokes said: “It’s the first opportunity for punters to weigh up the respective merits of the Irish Derby and French Derby form. We’re happy to leave that conundrum to the punters at this stage.
“We feel that the Longchamp race could provide some valuable pointers for the Ladbrokes St Leger. Hopefully the race will throw up a result that we can take with us to Doncaster.”
Ladbrokes betting – Grand Prix de Paris: 1m 4f, Longchamp, This Thursday
11/4 Reliable Man, 11/4 Seville, 11/4 Treasure Beach, 11/2 Bubble Chic, 8 Meandre, 16 Grand Vent, 16 Kreem, 25 Marksmanship, 150 Freedom.