The Cubs placed left-handed pitcher on the 15-day injured list Saturday with a left shoulder strain and recalled right-handed pitcher Michael Rucker from Triple-A Iowa.
Rucker is 0-1 with a 5.40 ERA in 11 relief appearances for the Cubs this season. He has walked seven and struck out 18, good for an average of 9.72 K/9.
Selected by Chicago in the 11th round of the 2016 draft out of Brigham Young University, Rucker made his major league debut with the Cubs last season and is 0-1 with a save and a 6.40 ERA in 31 career relief appearances. He is 20-14 with three saves and a 3.42 ERA in 116 career minor league games (42 starts).
Miley, 35, is 1-0 with a 2.84 ERA (6 ER/19.0 IP) in four starts with the Cubs this season.