His place on the roster will be filled by Carlos Zambrano.
In his second stint with the Cubs, Howry appeared in 24 games and posted a 5.66 ERA. Chicago signed the veteran in late May following his release by the Arizona Diamondbacks.
During his career, Howry has pitched for six teams -- including the White Sox. He has a 3.84 career ERA in 13 big league seasons.
Bruce Levine covers Major League Baseball for ESPNChicago.com