The Angels placed Anderson on the 15-day injured list Monday due to right shoulder inflammation.
The injury may have cropped during his last appearance Sunday, when he allowed six runs on six hits and one walk while striking out two in one inning of relief against the Marlins. A minimum stint on the IL would have Anderson back in action in late August, though he'll undergo more tests on his throwing shoulder to help shape a recovery timeline. The Angels selected Sammy Peralta's contract from Triple-A Salt Lake in a corresponding move.