Barnhart is not in the Reds lineup on Tuesday against the Giants, Zach Buchanan of the Cincinnati Enquirer reports.
Barnhart should be back in the lineup on Wednesday when the Reds take on left-hander Madison Bumgarner and the Giants. The 25-year-old has continued to get better each month, hitting a very respectable .308 in 52 July at-bats. Ramon Cabrera will get the start behind the plate for the Reds on Tuesday.