The Rockies recalled Hollowell from Triple-A Albuquerque on Saturday, Thomas Harding of MLB.com reports.
Hollowell has been solid out of the bullpen in Triple-A this season with a 1.54 ERA and 1.25 WHIP while striking out 14 batters through 11.2 innings. He has a bit of major-league experience from last season with Colorado -- he allowed six earned runs over seven frames and struck out eight. Hollowell will replace Dinelson Lamet on the Rockies' pitching staff after Lamet was DFA'd by the team Saturday.