By Racing uk.com staff
Ireland's perennial champion trainer could have as many as three runners in the Flemington showpiece on November 7, with 2015 runner-up Max Dynamite and Wicklow Brave, who disappointed in last year's renewal, also in contention.
Thomas Hobson is a general 20-1, with Max Dynamite 33-1 with most firms. Paddy Power quote Wicklow Brave at a standout 100-1.
Moreira, who is nicknamed 'Magic Man', was aboard the Tony Martin-trained Heartbreak City when he was beaten just a head by Almandin last November.
Patrick Mullins, assistant to his father, said: "It's magic that someone with his experience wants to ride Thomas Hobson - it's a big endorsement of his chances.
"He went very close to winning the race on Tony Martin's horse and it's great to have him on board."
Mullins confirmed Wicklow Brave could first contest the Caulfield Cup on Saturday week.
"David Casey is down there with the horses and he's happy with how Riven Light is working," Mullins added.
"There's some great prize-money on offer and it will be interesting to see how he measures up to Australian horses."
Riven Light will be ridden by Glen Boss in the 10-furlong contest and faces 10 rivals, including Aidan O'Brien's pair of Johannes Vermeer and The Taj Mahal.