Irvin will be called up from Triple-A Lehigh Valley to pitch Sunday versus the Braves, Todd Zolecki of MLB.com reports.
Manager Gabe Kapler neglected to say whether Irvin would work as a traditional starter or follow an opener, but he's set to see the bulk of the innings Sunday regardless. The 25-year-old allowed one run over seven innings during his first major-league outing of the season, but he has a 7.53 ERA and 1.47 WHIP over 14.1 innings since then.