Scioscia said that he wouldn't use Pineiro in close games while the right-hander works to solve the problems that brought about his recent four-game stretch in which he 0-3 with a 14.85 ERA.
"He'll be in a spot where he can get in a game and work on some stuff, so we'll either be up or down by a lot," Scioscia said. "That's where we are right now with him. Hopefully, he'll be able to get enough pitches and outings to see where he is, and combine it with the work he's doing with Mike Butcher.
"There's a lot of pitfalls to having to make this move, you don't want his length to evaporate. ... He needs to get off that treadmill and find himself."
Pineiro (5-6, 5.31 ERA) was last a reliever for the Boston Red Sox during the 2007 season, but he switched to a starting role following a midseason trade to St. Louis that year.