The Angels reassigned Warren to minor-league camp Friday.
Warren struggled last season with the Angels, logging a 5.63 ERA and 1.50 WHIP, and it cost him his spot on the 40-man roster. His spring numbers were much better, however -- a promising sign that the 27-year-old reliever might perform well enough at Triple-A to reclaim his spot on the 40-man and eventually return to Los Angeles.