Houston right-hander Jake Odorizzi wasn't among the 12 pitchers the team for the best-of-five series. Odorizzi struggled in his first season with the Astros after signing a three-year, $23.5 million contract, going 6-7 with a 4.21 ERA.
Left-hander Dallas Keuchel didn't get a spot on a Chicago roster that also has 12 pitchers. Keuchel was 9-9 with a career-high 5.28 ERA this season.
The Astros included six outfielders on their roster. Rookie Jose Siri got the final outfield spot; his availability was in question because he broke his right pinkie last week.
Also omitted from Houston's roster was reliever Blake Taylor, who made 51 appearances and recorded a 3.16 ERA this season.
The White Sox have seven infielders, five outfielders and two catchers on their roster. Houston is going with five infielders and three catchers.
The Associated Press contributed to this report.