The fight will take place at London's O2 Arena on Saturday 17 July and is being organised by Oscar De La Hoya's Golden Boy promotions, who manage McEwan. The Capital fighter, who is based in Los Angeles, has had 18 successful fights in the United States.
McEwan said: "I've already told Golden Boy I want to be on the bill with Amir Khan. I've also pointed out that, on 17 July, Hearts play Millwall, Celtic play Arsenal and Aberdeen play Crystal Palace– all in London – so it would be ideal for a marketing ploy aimed at all those Scottish football fans in London on that day to come to the O2 Arena in the evening.
"I know that most Hearts fans know I'm a big Hibs fan but they could come along to the O2 Arena and urge my opponent on to beat me!"
Meanwhile, McEwan has been handed a sponsorship deal by city lighting firm Kelvin Lighting. The firm's boss, Scott Kelly, used to box out of McEwan's father Rab's Clovenstone gym and sparred with McEwan in his amateur days.