The pair announced yesterday they would trade blows in a super middleweight contest at the O2 Arena on February 23.
The fight has long been expected and their brewing rivalry over the last few years will reach boiling point in seven weeks’ time.
DeGale suggested the grudge match is a “retirement fight” for the loser, with both men still trying to rebuild their reputations from recent losses.
DeGale (25-2-1), whose name occupies the left side of the bill, shockingly lost his IBF world title to Caleb Truax in December 2017 and despite avenging the defeat four months later is still yet to convince fans he’s not on the decline.
Eubank Jr (27-2), meanwhile, looked bereft of ideas during his points loss to George Groves in February 2018 and won a tune-up fight in September.
The bout will be shown on ITV Box Office, which drew some criticism from boxing fans who feel they should not pay for what is more a grudge match than an elite level fight.
When posed about the prospect of backlash, DeGale, 32, asked iFL TV: “How can you knock this fight?
“Right about now is about being in fights that people want to see me in.
“I think the majority of England and a lot of the boxing fans want to see this fight.
“The rivalry with me and Eubank goes back from when he come to my gym – we did six rounds or whatever, I don’t know.
“He left, the day after on Twitter he said he schooled me. And from there it’s gone back and forth.
“Finally now I get my just to shut him up, embarrass him, school him. I’m gonna show him how to box, again.”
DeGale also made clear his intention not to outstay his welcome in the sport, and admitted he could well retire after this fight, win or lose.
The plan remains to fight for a world title once more, though, after relinquishing it in early 2018 so he could secure some box-office fights before his career ends.
“I spoke to my advisor Al Haymon, and I will get the chance to box for another world title before my career is done,” DeGale claimed.
“I would like to be a three-time world champion. I would like to win the WBC or the WBA, whatever.”