Sixties Groove, who was purchased by Australian Bloodstock last year, won two races in Melbourne over the winter before a short break. He resumed with a placing at Ballarat in September before taking the Moe Cup earlier this month.
Sixties Groove is one of 13 horses to contest the Lexus, with Weir also running Gallic Chieftain and Yogi in the final ballot-free race into the Melbourne Cup.
Meanwhile, trainer Chris Waller has confirmed his Metropolitan Handicap winner Patrick Erin was still in the race for a Melbourne Cup start despite being scratched from yesterday's Bendigo Cup with a minor elevation in temperature.
"Whilst his temperature remained within normal parameters, it was decided to err on the side of caution and scratch him from today's event," the Waller release read.
"We will take a blood sample from Patrick Erin tomorrow (Thursday) and that will determine if he runs on Saturday at Flemington in the Lexus Stakes with the view of qualifying for the 2018 Melbourne Cup."
Meanwhile, in other Cup news Ryan Moore, who has won some of Europe's great staying races for owner Lloyd Williams, will get the chance to ride a Melbourne Cup winner for him after being confirmed as riding The Cliffsofmoher.
Moore, who teamed up with the Williams-owned Order Of St George for wins in the 2016 Ascot Gold Cup and the following year's Irish St Leger, knows The Cliffsofmoher well having ridden him into second place in the English Derby.
The Cliffsofmoher turned in a great Melbourne Cup trial in his first run in the country when third in the Caulfield Cup for jockey Hugh Bowman, but even so, he could go into next Tuesday's Cup as trainer Aidan O'Brien's third-best chance of taking his first Melbourne Cup.
O'Brien also trains the favourite Yucatan, who is to be ridden by James McDonald, as well as the lightweight Rostropovich.
Rostropovich ran fifth for Moore in last Saturday's Cox Plate but the rider cannot make his Cup weight of 51kg. The champion English jockey, who is the No. 1 rider for O'Brien's Ballydoyle operation, has ridden once for Williams in the Melbourne Cup when Bondi Beach ran 13th in 2016.