Miller (oblique) will throw a normal bullpen session Wednesday, Daniel Kramer of MLB.com reports.
Miller has previously thrown off the mound at less than full effort, but he'll throw his first standard bullpen session since he came down with inflammation in his left oblique in late February. The Mariners haven't revealed a target date for Miller's return to game action, but it will be close as to whether he can ramp back up in time for Opening Day.