The Dodgers needed help at catcher. Yasmani Grandal left Sunday's game after taking a ball off his mask. X-rays were negative.
The 25-year-old Barnes had one hit in five at-bats in his first stint with the Dodgers before he was optioned to Oklahoma City on June 2.
Meanwhile, outfielder Carl Crawford joined the team and is expected to be activated on Tuesday. He has been out since April 28 with a right oblique strain.