The Dodgers optioned Barnes to Triple-A Oklahoma City on Thursday.
After giving up seven earned runs in seven bulk-relief innings Wednesday, Barnes will be sent back to Triple-A to make room for a fresh arm in the form of Paul Gervase. The 30-year-old Barnes has now given up 10 runs over 12 innings in the majors this season, but he remains an option to rejoin the big club later in the year to provide length out of the bullpen.