Joshua unified the WBA and IBF titles with his famous win over Wladimir Klitschko last April, before subsequently battling out a late stoppage win over Takam in Cardiff in October.
"I like to fight, that's the main objective, and it's showing I'm never shy of a competition", Joshua said.
"But I think I can beat anyone in the world - I would not be here if I did not believe in myself". "Champions should fight Champions and AJ continues to step up to the challenges".
The fight will be the first time in history that two reigning heavyweight world champions have met in the United Kingdom.
"These fights aren't easy, there's a lot on the line so respect to Parker for taking the fight".
It is a unification Heavyweight championship fight, we all know what happened last time I was in a unification Heavyweight championship fight against Wladimir Klitschko previous year.
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Joshua aims to unify the heavyweight division in 2018 and win over Parker would see him claim the WBO belt - with only Deontay Wilder's WBC title left to win.
Then last week, it emerged that Parker's promoter, David Higgins, was flying to London to try and seal the deal.
Joseph Parker has done things the hard way from New Zealand to get to this point and won't be willing to give up his WBO title without one hell of a blood bath.
"All I'm focused on is being in great shape, training hard and doing my best to knock him out and catch his glass jaw", Parker said.
"New Zealand might be a tiny country on the other side of the world but it has a hugely proud sporting tradition - and a particularly strong tradition when it comes to whipping mother England".
When Norton questioned Parker's body shape and labelled him "the king of pies", Joshua laughed and suggested "Pie Man" might be a good nickname for the Kiwi. Afterwards it was a case of "when" not "if" boxing would return and we are thrilled to be working with Matchroom once again to raise the bar for live boxing entertainment on March 31st. This is when it actually makes sense to have multiple world titles when they come together and are put on the line.