Harrison, who reclaimed his world crown from Manuel Medina in November, expects a bruising challenge from the Armenian.
“I don’t know too much about him,” Harrison told BBC Sport. “But he’s a tough southpaw.
“He’s never fought for a world title before, but he’s young and he’s going to be a tough prospect.”
“He says he’s going to go to war with me, so I’ll have to take the war to him.”
Fight promoter Frank Maloney also warned Harrison that Abelyan, 25, will present a real threat to his crown.
“He (Abelyan) can switch styles and he can be dangerous,” said Maloney.
“He comes from an eastern background but his training in the US has given him an extra dimension.
“He’s almost as tall as Scott and he likes to mix it up. It will be a really tough fight.”
Abelyan comfortably beat Jose Luis Tula on points and knocked out Alejandro Mona in his two bouts last year.
Uddingston boxer Lawrence Murphy will defend his WBU middleweight title on the same bill after his first-round knockout win over Wayne Elcock.
Murphy faces the challenge of former WBU champion Anthony Farnell of Manchester.