Hernandez was designated for assignment by the Rockies on Mar. 29.
Gregg allowed just one run in 11 innings during spring training, but lost out on the final Dodgers bullpen spot.
Harang has made just six relief appearances in his 11-year career, but vows to be ready to pitch whenever needed. Even if that role has yet to be defined.
The unexpected starting shortstop reflects on making his second consecutive opening day roster, and his manager recounts how the decision was made.
The Dodgers have $40.5 million committed to four players on the disabled list, more than triple the amount as last year.
The Dodgers on Sunday finalized their opening day roster, including recalling Justin Sellers, who is expected to start at shortstop in the absence of Hanley Ramirez.
The Dodgers on Sunday announced their 2013 opening day roster, which includes 12 pitchers, 13 position players, and four players on the disabled list.