Irvin had been considered a candidate to start on Sunday against the Atlanta Braves. Instead, Irvin and Neshek will be available to pitch behind Vince Velasquez, who returns to a starting role after pitching in relief in his last nine appearances.
Irvin was 2-0 with a 2.44 ERA in eight games, all starts, for Lehigh Valley. He is 2-1 with a 5.48 ERA in four games with Philadelphia this season.
Neshek was placed on the injured list on May 25 with a right shoulder strain.