The Reds released Zimmer on Aug. 9.
After making 52 appearances in the majors for Kansas City in 2021, Zimmer joined the Reds on a minor-league deal this offseason and was unable to earn a spot in Cincinnati's Opening Day bullpen. Over his 30 innings at Triple-A Louisville this season, Zimmer posted a 6.90 ERA and 1.97 WHIP.