Wood hasn't pitched since April 13, making the roster retroactive to April 14.
In 2 1/3 innings over four appearances this season, Wood, 34, is 0-1 with an 11.57 earned run average.
Over a 14-year major-league career -- 12 seasons with the Cubs -- Wood is 86-74 with 63 saves and a 3.66 ERA.
The Cubs recalled left-handed pitcher Scott Maine from Triple-A Iowa to take the open roster spot. Maine is 1-0 with a 1.42 ERA in five relief appearances for Iowa.
Maine, 27, has appeared in 20 games for the Cubs over the last two seasons without getting a decision but posting a 4.95 ERA.