The 22-year-old Broncos star represented Samoa at the last World Cup and told the Courier Mail he was available to face England in May.
International eligibility laws were relaxed last year, allowing eligible players to nominate both a tier one and tier two nation to represent, with no stand-down periods and the ability to switch multiple times.
Milford is free to play for Samoa if he's overlooked by Australia and could even play for both this year, as well as the Queensland State of Origin team.