"We're not very deep right now," general manager Jon Daniels admitted. "We could use Derek Lowe out of the bullpen and Justin Grimm [at Round Rock] is on the [40-man] roster."
Harrison has started the season 0-2 with an 8.44 ERA for 10 2/3 innings, losing to both the Astros and Angels.
Jim Reeves is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.