Gallagher will wear No. 36 and is available for tonight’s game in Houston at 7:05 p.m. CT.
Gallagher, 21, begins his third stint with the Cubs and has posted a 5.73 ERA (7 ER/11.0 IP) in five relief appearances with the big league club. He picked up his first career save July 18 vs. San Francisco, tossing the final 4.0 innings of a 12-1 victory at Wrigley Field. He made his big league debut June 9 at Atlanta, tossing 3.1 relief innings.
Originally drafted by the Cubs in the 12th round of the 2004 Draft, Gallagher has split time between Double-A Tennessee and Iowa this season, combining to go 10-3 with a 3.03 ERA (29 ER/86.0 IP) in 16 starts. Most recently, he has gone 2-0 with a 1.13 ERA (2 ER/16.0 IP) in three starts with Iowa dating to July 24, walking one and striking out 16 in that span.
Ohman, 29, is 1-4 with a 5.06 ERA (18 ER/32.0 IP) in 47 relief appearances for Chicago this season. Selected by the Cubs in the eighth round of the 1998 draft, Ohman owns a 4.34 ERA (75 ER/ 155.2 IP) in 211 career relief appearances. Last season, he set career-highs in games pitched (78), innings (65.1) and strikeouts (74), finishing 1-1 with a 4.13 ERA (30 ER/65.1 IP).