"It was a one-time thing," Rangers farm director Tim Purpura said. "He had some pain, we had it looked at and found it was torn. There was no knowledge beforehand there was anything wrong. It's regrettable.
The Rangers released Miller in order to make room on their 40-man roster. Purpura said that at some point, the club intends to re-sign Miller, who was a 16th-round pick by the Rangers out of Fresno State in the 2008 First-Year Player Draft and went 9-1 with a 1.81 ERA in 48 games with Double-A Frisco last season.