Benn, 53, was open to a third fight with Eubank last year.
Other possible locations include Nigeria, Dubai and Cardiff.
Both boxers have given differing opinions on how the fight will play out.
McGregor will take on Floyd Mayweather in a highly anticipated boxing match on 26 August.
Footage of McGregor struggling in a sparring session emerged after fight confirmation.
UFC superstar will face a hefty lawsuit if he breaks Queensberry rules.
Ward had spoken of his desire to move up a weight class and add another belt to his collection.
Owen Roddy says Conor McGregor has a knack for shocking the world and will do it again.
Mexican believes he would beat WBO champion with "one hand tied behind my back and my eyes closed".
Middleweight king claims his September bout with Saul "Canelo" Alvarez is the true boxing contest.
McGregor is not expected to return to the UFC after his fight with Mayweather.
Ward is 32-0 after retaining his WBA, WBO and IBF light heavyweight titles against Sergey Kovalev.
However, both camps are confident of settling the issue swiftly.
The big money boxing fight is expected to top $1bn in revenue.
McGregor first floated the idea of challenging Mayweather nearly two years ago.
'The Money Fight' will bring sanitised sports events to a new low as both entities' struggles are exposed.
UFC heavyweight champion Stipe Miocic has called out his boxing counterpart on Twitter.
The highly anticipated boxing match will take place in Las Vegas on 26 August.
The bout will be a 12-round fight with 10-ounce gloves and at a weight limit of 154 pounds.
Mayweather Promotions were due to formally request the date from the Nevada State Athletic Commission.