Miller will rejoin the Mariners' rotation following the injury to Emerson Hancock (adductor), Daniel Kramer of MLB.com reports.
Miller did not make any relief appearances after manager Dan Wilson announced last week that the righty would be demoted to the bullpen, and he's now re-entering the rotation. The right-hander has posted a 7.18 ERA and 27:16 K:BB across 36.1 frames since the All-Star break. Miller will start Wednesday's game in Boston.