Castro will compete in spring training for a spot in Houston’s season-opening bullpen after being cut loose back in August by the Diamondbacks after missing most of last year due to shoulder inflammation. The 30-year-old righty made 75 relief appearances the previous season for Arizona. He holds a serviceable 4.20 ERA, 1.38 WHIP and 410/233 K/BB ratio across 460 2/3 innings (419 appearances) in the big leagues dating back to 2015. He’ll presumably operate in middle relief for the Astros if he gets back to the majors.

Castro was cut loose back in August by the Diamondbacks after missing most of last year due to shoulder inflammation. The 30-year-old righty made 75 relief appearances the previous season for Arizona. He holds a serviceable 4.20 ERA, 1.38 WHIP and 410/233 K/BB ratio across 460 2/3 innings (419 appearances) in the big leagues dating back to 2015. He’ll presumably operate in middle relief for Houston.

Castro went unclaimed on waivers after being designated for assignment earlier this week at the trade deadline. The 29-year-old righty, who missed time earlier this year due to a shoulder injury, figures to generate some interest on the open market after making 75 relief appearances last year for Arizona.

Castro was a key component of Arizona’s relief mix last year, but missed nearly three months due to shoulder inflammation and now loses his roster spot to veteran Dylan Floro.