According to Patrick Saunders of the Denver Post the Rockies designated pitcher Jason Grilli for assignment to make room for reliever Matt Daley. Grilli has an unusual line so far this year. In 19.1 innings he has 22 strikeouts, but he's allowing over two baserunners per inning.
In a separate move, the Rockies called up outfielder Carlos Gonzalez, one of their acquisitions in the Matt Holliday deal. So far, Gonzalez has an OPS over 1.000 in Triple A.