Bruising American Brian Minto will meet Parker in Auckland on July 5 at a yet-to-be-determined venue.
Minto, ranked 12th in the world by the WBO, beat Cameron by TKO in December when the Kiwi was unable to continue after the seventh round due to cuts above his eyes.
Cameron, who was targeted by Parker's handlers Duco as a potential opponent for this year, hasn't fought since he lost to Minto and seems unlikely to don the gloves again.
"Brian Minto is a great challenge for Joseph Parker," Parker's trainer Kevin Barry said.
"I think we all saw last year in the Shane Cameron fight just what Minto brings to the table. We said we planned on challenging Joseph in each of his fights and this is a real big challenge. Minto is a very durable, very experienced guy."
Barry trained Minto for his fight with Cameron but Minto will now need a new coach.
Minto's WBO Oriental heavyweight title will be on the line, while Parker's interim WBA PABA crown, which he won after he beat Marcelo Luiz Nascimento in Germany during the weekend, will also be up for grabs.
If Parker was to claim another international title it would continue to boost his stock and he is expected to be ranked 15th with the WBA following his TKO victory over Nascimento.
Minto, 39, is a rough fighter, known for leading with the head and not being opposed to using elbows, which will be a big test for Parker to stay away from getting caught in a street fight.
The 22-year-old South Aucklander has been cut in his past two fights, although in widely different circumstances, so his durability will also be thoroughly examined.
Minto (39-7) has similar dimensions to 1.80m veteran Sherman Williams, who was meant to fight Parker in Germany on the undercard of Wladimir Klitschko's successful world heavyweight title defence against Alex Leapai, but withdrew at late notice.
Parker, who suffered a perforated ear drum during the bout with Nascimento, was due to return to New Zealand overnight (NZT) after he was cleared of serious injury by a doctor in Oberhausen and given antibiotics for his ear.
He will spend two weeks with his family before heading back to Las Vegas for a training camp.
Given Parker's aggressive handlers, who want to push the young heavyweight, people will again question the thinking of putting the 8-0 prospect in the ring with such a tricky opponent.
Parker has maintained he would never take a fight he wasn't comfortable with and wants to be challenged.
"With everything that Duco does they always run it past us and make sure we are happy with it," Parker said.
"So it's not like a decision that only Duco makes. It's a team decision and we always sit down and talk about the fights that we have. I don't think they're pushing me too fast. We are taking the right steps."
Duco's Dean Lonergan made no apologies for seeking out another tough fight for their prized asset.
"We have to have him up against these sorts of guys," Lonergan said.
"We are copping some criticisms for pushing Joe too fast but we've said right the start, we're not going to line up patsies. We want to test him every time and learn from the mistakes."
Parker will likely fight again in October and December with undefeated Australian Lucas Browne mentioned as a potential opponent.
- Daniel Richardson of APNZ in Oberhausen/Daniel travelled to Germany courtesy of Duco Events Ltd
