BOSTON -- Matt Barnes had been grinding it out with discomfort in his left hip for at least 10 days, but the Red Sox decided that was no longer a smart move.
The righty setup man, who last pitched on Monday in Atlanta, will be shut down for at least the next several days.
An MRI on Thursday detected inflammation for Barnes, who had a 3.39 ERA and has held opponents to a .190 average in 58 appearances this season.
"I'm in the process of working with the medical staff and doing treatment and trying to get back as soon as possible," said Barnes.