Brook suprisingly surrendered his IBF world welterweight title against talented American Errol Spence Jr, a defeat that left him with a fractured eye socket and serious questions about his motivation to continue as a fighter.
This fight will mark the first appearance in a boxing ring for Brook since he lost his IBF title a year ago to American Errol Spence Jr at Bramall Lane.
Instead, Brook believes the danger posed by Belorussian fighter Rabchenko, who has lost only twice in his 31 contests in the paid ranks, will provide the impetus for him to put in a stand-out display.
Brook first must prove he still has what it takes against a challenging opponent in Rabchenko. The defeat by Golovkin was easy to cope with, the loss of his world title to Spence less so. "I haven't got time to be messing about".
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"I was in Sheffield, we'd sold a load of tickets and we were in a football stadium - but going from middleweight down to welterweight was too much and it just drained me".
'I was a proud champion and I never duck anyone, Errol is a class act and will dominate at 147lbs - hopefully I can get the rematch at super-welterweight though.
"If we fight the whole of Britain will be talking about it - especially if we look good in our next fights".
"Rabchenko is a risky guy, he's no mug and he can really bang".
"I'll be back in the gym Monday".More news: Russia's Putin unveils 'invincible' nuclear weapons; Mike Rogers says United States must act
"But I'm going to punish him for it, I'm going to slap him around the ring".
Hearn is looking to get Brook out again in the summer before securing a big fight at the end of the year. He's trained very hard for this fight.
"He's a handful and he's tough and clever". I don't want to look past this kid, but I want to be active.
"It's held up in sparring and I don't think about the eye injuries at all".More news: Oregon State Beavers open Pac-12 tournament