The Chicago Cubs' injury-riddled pitching staff suffered another blow when left-handed reliever Hoby Milner was placed on the 15-day injured list Saturday with appendicitis, with right-hander Tyler Ferguson being recalled from Triple-A Iowa.
Milner was 1-0 with a 3.53 ERA in a team-high 38 appearances.
"He woke up in the middle of the night and had major stomach pain," Cubs manager Craig Counsell said before Saturday's 8-2 win against the Milwaukee Brewers. "He Ubered himself to the emergency room and had surgery this morning.
"We're fortunate that he's OK. We're probably looking at four to six weeks."
Ferguson was called up by Chicago for the third time since being acquired May 7 in a trade with the Athletics.
Ferguson pitched Saturday and is 0-0 with a 2.45 ERA in three appearances with the Cubs, allowing one run in 3⅔ innings. He made one appearance this season with the A's, giving up four runs, including two homers, in 1⅓ innings.
He appeared in 56 games last season with the A's, going 4-2 with a 4.66 ERA.
The Cubs also activated veteran right-hander Bryse Wilson, who was claimed on waivers from the Philadelphia Phillies earlier this week, and optioned right-hander Jayden Murray to Triple-A.
Wilson was 3-5 with a 6.29 ERA in 12 games, including 11 starts, at Triple-A Lehigh Valley this season. He made one appearance with Philadelphia on June 18, tossing two scoreless innings, before being designated for assignment on June 22.
Milner joins the growing list of Cubs pitchers on the injured list.
Saturday's starter, left-hander David Peterson, was acquired Thursday from the New York Mets in exchange for minor league infielder Cole Mathis after starters Edward Cabrera (left hamstring strain) and Ben Brown (neck strain) were placed on the injured list Wednesday.
Starters Jameson Taillon (15-day IL, left hamstring strain), Justin Steele (60-day IL, left elbow flexor strain) and Cade Horton (60-day IL, right elbow surgery) already were out.
Right-handed reliever Phil Maton (right knee tendinitis) was placed on the 15-day IL on Saturday to make room for Peterson. Maton also was on the IL from April 8-27. He is 0-1 with a 6.08 ERA in 30 appearances with the Cubs.
The Associated Press contributed to this report.