Peters was designated for assignment by the Pirates on Thursday.
Peters hasn't played in a major-league game since Aug. 3 and has now returned from his rehab assignment for his left elbow. However, the Pirates placed him on waivers after his activation. The 30-year-old lefty has a 4.58 ERA and 1.32 WHIP on the season, so he's a candidate to be claimed by another team looking for another arm in their bullpen.