The Diamondbacks informed Ross on Sunday that he'll be included on the Opening Day roster, Nick Piecoro of The Arizona Republic reports.
Ross, who had been attending camp as a non-roster invitee, submitted a 7.71 ERA, 1.57 WHIP and 6:5 K:BB in seven innings during Cactus League play. The 32-year-old has worked primarily as a starter during his career but will operate as a multi-inning reliever for Arizona.