ANAHEIM -- Joel Pineiro was a late scratch from Wednesday afternoon's game against the Red Sox after suffering a left oblique strain while warming up.
Shields, the Majors' premier setup man from 2004-08 before knee surgery ended his '09 season, is making his first start since '03 and 15th of his Major League career.
Pineiro has been a rock of stability in his first season with the Angels, delivering 131 1/3 innings in 20 starts, going 10-7 with a 4.18 ERA. He had a seven-game win streak snapped in New York in his previous outing seven days ago, yielding six earned runs on 11 hits in six innings.
Pineiro complained about his lack of command after that game but gave no indication of any physical issues.
Shields is 0-3 with a 5.61 ERA in 32 appearances covering 33 2/3 innings.