Frias (back) began a rehab assignment with Triple-A Oklahoma City on Friday, Eric Stephen of SB Nation reports.

EDGE Analysis

The right-hander threw two scoreless innings, allowing two hits and one walk while striking out one, in his first appearance since Aug. 5. Frias appears on track to eventually join the Dodgers' September roster, but he's already had one setback, and a return to a starting role seems unlikely even with the team's ongoing issues at the back of the rotation.