Hopoate is now being managed by Stuart Duncan, one of Australia's best connected and most respected boxing identities.
The American-based Australian said the plan was for Hopoate to have three fights in the United States this year and two in Australia.
Duncan said the 33-year-old heavyweight would work with Australian trainer Justin Fortune in the US, while retaining his current training team in Australia.
He believes better quality sparring in the US will help add polish to the undoubted power Hopoate possesses.
While the Australian National Boxing Federation has reportedly ordered Hopoate to give Mirovic a rematch, the former rugby league star may well end up relinquishing the title as that fight doesn't necessarily fit into his plans.
Duncan said Hopoate was likely to spend time in his altitude training camp in the US before making his American debut, possibly in March.
The Sydney-based boxer has fought under 40 rounds since moving over from rugby league.
Duncan has managed a number of well credentialled Australian fighters including Sam Soliman and Jason Delisle and arranged important bouts for several other prominent local pugilists.