The bout will take place on March 30 at a Top Rank event in Philadelphia. "This will be an optional defense. We do not yet know the name of his opponent," Klimas said.
Potential opponents are Colombian Eleider Alvarez and Russian Artur Beterbiev.
Earlier it was reported that the WBC had allowed the Ukrainian to make a voluntary defense of the title before the fight with unbeaten contender Marcus Browne.
Gvozdyk became the WBC world light heavyweight champion after knocking out Canadian Adonis Stevenson in the 11th round.
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