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But the Darren Weir-trained star, who returned with a stunning win in the Memsie Stakes, is only an outside chance of starting in the $A7,050,000 ($NZ7,682,000) event on the first Tuesday in November.
Humidor was also named topweight for the Caulfield Cup yesterday, but is also an outside chance of starting in that race. The horse is being set for the Cox Plate and the Emirates Stakes.
The possibility Humidor will withdraw from the Melbourne Cup helps former Otago galloper Patrick Erin, who was weighted at 50kg yesterday.
The former Brian and Shane Anderton-trained 7yr-old has 105 horses weighted above him on the Melbourne Cup's order of entry.
Patrick Erin will need to win his way up the Melbourne Cup rankings to start in the 3200m feature.
He is being aimed at the group 3 Kingston Town Stakes over 2000m at Randwick on Saturday.
Patrick Erin will then be aimed at traditional Melbourne Cup lead-up The Metropolitan later this month.
Jon Snow, on 55.5kg, is topweight among the eight New Zealand-trained horses nominated for the Melbourne Cup.
The Murray Baker and Andrew Forsman-trained galloper is set to clash with Humidor and other Australian stars in the group 1 Makybe Diva Stakes at Flemington.
The other New Zealand-trained horses entered are Bonneval (54.5kg), Vin De Dance (53.5kg), Zacada (53kg), Sir Charles Road (53kg), Highlad (51kg), Pentathlon (51kg) and Our Abbadean (50.5kg).