The Cubs reinstated Miller (hip) from the 60-day injured list Thursday and designated him for assignment, Maddie Lee of the Chicago Sun-Times reports.
Miller has been on the injured list all season due to a left hip impingement. He began a rehab assignment in the minors April 15 and has since posted a 2.77 ERA and 1.69 WHIP across 13 innings at Triple-A Iowa. Despite his strong performance in the minors, the Cubs will push the 29-year-old off their 40-man roster and expose him to waivers. Miller finished last season with a dominant 2.32 ERA and 0.81 WHIP across 62 innings between Chicago and Seattle, so he'll likely attract interest on the waiver wire.