CHICAGO -- The Cubs placed left-hander Wade Miley on the 15-day injured list on Sunday with a left shoulder strain.
Miley also missed the start of the season with left elbow inflammation. He is 1-0 with a 3.38 ERA in three starts in his first season with Chicago.
The 35-year-old Miley hasn't pitched since he worked six innings of three-run ball in a 5-4 victory over Arizona on May 22. The IL move was made retroactive to Thursday.
"I don't think it's that big of a deal," manager David Ross said. "I think he'll be back soon.