Dereck Chisora says he will return to ring with fire in his soul and a point to prove when he faces Senad Gashi in London on April 20 after claiming Joseph Parker "wasn't ready for the battle".
Chisora had hoped to fight former WBO heavyweight champion Parker next month, but the New Zealander wanted more time to prepare.
A bout between Chisora and Parker on the undercard for Dillian Whyte's next fight in July looked to be a possibility, but Gashi will be the Brit's next opponent at the O2 Arena on the same night fellow heavyweights Lucas Browne and Dave Allen do battle.
Chisora was beaten by Whyte for a second time in his last fight in December and the 35-year-old is desperate to take his frustration out on Gashi - coming off a defeat of his own against Carlos Takam.
"Six weeks until I go back to WAR and boy I can't wait!" said Chisora. "On Saturday 20th April 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*tched out, he must have taken too many laxatives and sh*t 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."