Robles (back) joined the Red Sox in Anaheim and is expected to be activated off the 15-day injured list Thursday, Christopher Smith of MassLive.com reports.
Robles had been scheduled to throw a rehab inning for Triple-A Worcester on Tuesday, but the outing was postponed due to rain. Instead of taking part in the doubleheader Wednesday, he threw a bullpen session and flew to the west coast to hook up with the Red Sox.