Mercury is out of the mare Jerezana and will be the first of stallion Brazen Beau's progeny to race.
Mercury got a look at the straight course in a jump-out last week in preparation for Saturday's Listed Maribyrnong Trial Stakes (1000m) when he was held together to finish fourth..
“He was a lovely yearling and he looked good in his action in a straight-track jump out last week,” Godolphin trainer James Cummings said.
“He's got a bit about him this colt.
“He should be strong late here, which would be great to see in the first two-year-old race in Melbourne.”
Osborne Bulls, fifth in the Group One Sir Rupert Clarke Stakes at his most recent start, was withdrawn from Saturday's $200,000 Gilgai at Flemington to be saved for Saturday week's $500,000 Sydney Stakes at Randwick.
Mercury was at $12 on Thursday for the Maribyrnong Trial Stakes with the Tony McEvoy-trained colt Sun City the $4.60 favourite.