Warren was called up to the majors by the Angels on Friday, Rhett Bollinger of MLB.com reports.
Warren made 14 appearances for the Angels last season, recording a 5.63 ERA and 1.50 WHIP in that time. However, a perfect 0.00 ERA in Triple-A over seven frames to start the year offers optimism for more success this time around. Jimmy Herget was optioned to Triple-A Salt Lake in a corresponding move.