Grilli has served as a mop-up man for the Tigers the past two years, eating bullpen innings at a mediocre ERA. The Rox may have been drawn to his typically decent groundball rates.
Simons appears to be a long shot to reach the bigs; he wasn’t among the Rockies’ top 30 prospects.
The Rox also completed their long-rumored deal for lefty Jorge de la Rosa. He’ll jump right into the rotation. The 27 year-old is an interesting arm when healthy.