Eubank Jr has consistently played down the idea of retiring should he be beaten but admitted a third loss of his career – added to defeats by Billy Joe Saunders and Groves – would be hugely damaging.
DeGale has faced accusations his best years are behind him but insists he has overcome persistent injuries to reach his best condition “for a long, long time”.
Eubank Jr, meanwhile, claims he will benefit from teaming up with trainer Nate Vasquez, who he met at Mayweather’s Las Vegas gym.
In the past, the Brighton fighter was guided by his father and the man who trained Eubank Sr, Ronnie Davies.
“For the first time in my career we are focusing on strategy and game plan in a tailored boxing camp, preparing me for a slick southpaw,” said Eubank Jr.
“We have covered all bases, that is why I am so confident. If he runs we have a game plan, if he stands and plants his feet, we have a plan.
“This is my opportunity to prove once and for all, to set the records straight, to prove to the doubters and haters that I am the real deal.
“I am at a stage where I know he can’t handle me. I am going to go there and stop him.”