Derek ‘WAR’ Chisora will face Senad Gashi in his first fight since losing to Dillian Whyte in their December rematch.
The revitalised heavyweight is set to return to action on the same show as Dave Allen vs Lucas Browne.
On the undercard, Josh Kelly continues his welterweight progression against Przemyslaw Runowski, Joe Cordina meets Andy Townend for the British lightweight title and Conor Benn has his 14th bout.
“Six weeks ‘til I go back to WAR and boy I can’t wait,” said Chisora.
“On Saturday April 20 I will be stepping into the ring at The O2 with fire in my soul, I have a point to prove and mission to continue.
“Parker b****ed out, he must have taken too many laxatives and s*** himself.
“He wasn’t ready for the battle, he reckons he needed more time.
“Gashi has shown he is a true fighter, he is always ready to go to war when called.
“He showed this in December when he stepped in the ring with Takam on just one week’s notice and gave him a real fight.
“I’m not stupid, I know with six weeks’ notice in April Gashi will be a different animal.
“He is a wild horse, a loose cannon, he is coming to win but trust me, he won’t hear the final bell.
“I’m ready, we’ve stepped things up a gear working hard with Dave Coldwell.
“April 20th ‘WAR’ Chisora will be back in London to show the heavyweight division exactly why retirement wasn’t an option.”