Soriano was added to the Marlins' 40-man roster Tuesday.
Soriano produced a 2.49 ERA, 1.15 WHIP and 49:23 K:BB across 47 innings at Triple-A Jacksonville last season, so the Marlins opted to protect him from the upcoming Rule 5 draft. The 23-year-old could be in the mix for a spot on the Opening Day roster with a strong showing in spring training.