Parker will go into the Dimitrenko fight in late September at a New Zealand venue yet to be confirmed with a perfect 20-fight professional record following his fourth-round knockout of Australian Solomon Haumono in Christchurch last week.
Parker dominated the fight against the predictable Haumono, finishing it with a straight-left, right-uppercut combination, and he will be expected to have too much speed and class for Dimitrenko, who, like famous compatriot Wladimir Klitschko, is based in Germany.
The 24-year-old Parker's rise up the ranks to become the mandatory challenge to Englishman Joshua's IBF title has not gone unnoticed by Tyson Fury's trainer and uncle Peter Fury, who said in a recent interview: "I think they'll all threats [to Fury's titles], but Deontay Wilder, Luis Ortiz, Joseph Parker, I think they're the realistic threats at the moment."
American Wilder recently defended his WBC title, and Ortiz is an undefeated Cuban with the nickname of "King Kong".
The omission of Joshua from that list would have been deliberate. Tyson Fury, who will defend his WBA and WBO titles against Klitschko in a re-match in Manchester in October, has never got on with Joshua, but a fight between the two Englishman would be hugely lucrative for both.