Promoter Kalle Sauerland, of MF Pro, said victory would take Riley to a new level.
“Challenging Masternak, the hardman of the cruiserweight division, officially launches Viddal’s assault towards world titles,” said Sauerland.
“A fight with Masternak has been a rite of passage for so many of the best cruiserweights of the last decade or more, and we believe that Viddal is destined to get to the very top.
“But be under no illusions, there is no easy way to get there and he must be better than he’s ever been before, in order to get past the European champ.”
