Arthur will be fighting in front of a home crowd in December

Arthur, 29, stopped Koba Gogoladze in July to claim the temporary crown.

And he is in line to take the full WBO crown from Joan Guzman, who looks likely to vacate the title.

"This is a tremendous occasion as Edinburgh has never had a world champion fight for his own title in his city," said Arthur.

Salford-based Foster Jr said: "I feel strong and I'm confident about moving up a weight. It will be a good night."

Foster Jr, the son of Steve 'The Viking' Foster, is stepping up from featherweight for the bout but the defending champion expects one of the toughest fights of career.

Arthur added: "To be coming up against a former world champion like Stephen is brilliant and I have the greatest respect for him.

"We both came along at the same time, different weights but quite similar records and amateur experience.

"He was a top-class amateur and I was a top-class amateur. Now we are on a collision course.

"It will be the fans that are winners because I won't take a backward step and I'm pretty sure Stephen won't either so it should be a great fight."