Sources close to Abraham revealed some of the details a few days ago, which World Boxing News then had rubberstamped over the weekend, along with the fact ITV Box Office will televise the encounter next month.
Eubank Jr. won the IBO super-middleweight championship on the same channel when defeating Renold Quinlan in February.
Having moved up from 160 pounds, Eubank was linked to several high-profile names until the 27 year-old has eventually settled on Abraham.
For Abraham, an upturn in form since losing his WBO version to the impressive Gilberto Ramirez has put the veteran back in the title picture and facing Eubank represents a first contest on British shores for the highly-experienced contender.
A veteran of 51 bouts, Abraham, 37, is recognised as one of the main players at 168 but has seen better days and contemplated retirement a year ago before scoring wins over Robert Steiglitz and Tim Robin Lihaug.
Facing Abraham is still a step up for Eubank, who was due to battle Gennady Golovkin in September last year until a disagreement over the contract meant the plug was pulled.
Golovkin went on to stop Kell Brook in five rounds and Eubank then made the trip north eight pounds to the super-middleweight limit.
Phil Jay is Editor of World Boxing News. Follow on Twitter @PhilDJay