United will play Victory in a preseason match on July 15, in addition to a fixture against Premier League rivals Crystal Palace at the MCG four days later.
Yorke — who played for United when it faced the Socceroos at the MCG in 1999 — was in Melbourne on Thursday to join the Victorian government in announcing the club's visit to the city.
He said Ronaldo was likely to make the trip to Australia.
"He is our player. He is contracted for another season as well," Yorke said.