Miller signed a minor-league contract with the Pirates on Saturday, Jason Mackey of the Pittsburgh Post-Gazette reports.
Miller was released by the Cubs at the beginning of June after being designated for assignment, and he'll now report to Triple-A Indianapolis once he clears COVID-19 protocols. The right-hander made three starts for Triple-A Iowa this year and posted a 1.74 ERA and 0.99 WHIP over 10.1 innings.