Chris Eubank Jr and Gennady Golovkin are on the cusp of agreeing to fight in London, according to Eddie Hearn. The promoter revealed "terms have virtually been agreed" between the two parties for a much-anticipated bout in September.

Eubank, 26, is set to defend his British middleweight title against Tom Dorran at the O2 Arena in London on Saturday (25 June). But Hearn now reveals he has already held negotiations with Golovkin's camp over a fight, and all of the details have virtually been agreed.

"There's been lots of conversations, contracts have been drafted, terms have virtually been agreed," Hearn told Sky Sports of a potential fight between the Brit and Golovkin, who boasts the highest knockout percentage in middleweight championship history.

"Obviously Eubank has his own fight to take care of on Saturday night, and I think although he is strong favourite he should not overlook Tom Doran; it's a huge opportunity for him too.

"There's a few things to tie up but basically if everyone wants this fight then it's all there to sign. If Golovkin really wants this fight, and I believe he does, and if Eubank wants the fight, which he does, then there's a real chance of that fight happening in London in the autumn."

Hearn said that a potential fight is almost certain to be held in an outdoor stadium, which he thinks makes for a better atmosphere. "I think it would be a stadium fight," the promoter said. "I think there would be the demand for 40-50,000 tickets. There is something nice about being in an arena but as we saw at Goodison Park [for Tony Bellew v Ilunga Makabu], you can guarantee a great atmosphere outdoors too."

Asked whether Golovkin's camp would be happy to come to London, Hearn said: "Yes, 100%."

The unbeaten Kazakhstani is the current holder of the unified WBA, WBC, IBF and IBO middleweight titles, and is widely acknowledged as one of the best pound-for-pound fighters on the planet. Eubank Jr, meanwhile, has lost only one fight as a professional, to his British rival Billy Joe Saunders, and is considered one of the sport's rising stars.