Peters was recalled by the Pirates on Friday, Jason Mackey of the Pittsburgh Post-Gazette reports.
Peters has shown very little in 132.2 career major-league innings (24 starts and seven relief appearances), struggling to a 5.83 ERA and 1.61 WHIP with just a 16.7 percent strikeout rate. It looks as though he's up as a reliever for his first opportunity with his new team, after being acquired from the Angels in mid-July in a trade for cash considerations.