Officials are hoping to get at least four overseas entries for races during The Championship at Randwick.
Nominations for all races over the first two Saturdays in April close on Monday.
Sydney’s richest race, the $4 million Queen Elizabeth Stakes (2000m) on April 9 was won last year by Criterion from English star Red Cadeaux.
Japanese horse Real Impact won the 2015 George Ryder Stakes on the way to his second to Kermadec in the $3 million Doncaster Mile.
At least three horses from Japan and one from Hong Kong are expected to be among the nominations for the Sydney autumn carnival.