Warren (triceps) walked two batters in a scoreless inning during his rehab appearance Tuesday with Triple-A Salt Lake.
Warren went on the 15-day injured list June 18 with the left triceps strain, so he'll likely need only one more rehab appearance, at most, before being deemed ready to rejoin the Angels. The 26-year-old has turned in a 3.97 ERA and 1.50 WHIP across his nine relief appearances with the big club this season.