Parker's trainer Kevin Barry has been trying to harness Parker’s aggressive side for his bout with fellow Samoan Alex Leapai this Sunday in Rhode Island.
Tua said former foe Cameron visited him during his eight days of getting his traditional Samoan tattoo.
The creator of the Rocky franchise, Stallone thanked the British heavyweight for his tribute to movie character Apollo Creed.
Ruiz Jr knocked out Joshua in the seventh round to become the new WBA, WBO, IBO and IBF heavyweight champion.
Andrei Mikhailovich, who was adopted and brought to New Zealand as a baby, is unbeaten in eight pro bouts.
Lani Daniels will compete for the vacant WBO women's light heavyweight world title against fellow Kiwi Geovana Peres on March 30.