Barnhart is out of the lineup Sunday against the Pirates, Bobby Nightengale of The Cincinnati Enquirer reports.
The 30-year-old will finish the season on the bench for the third time in the final four games with Tyler Stephenson receiving another start. If he doesn't make an appearance off the bench, Barnhart will finish 2021 with a .247/.317/.368 slash line, seven homers, 21 doubles, 48 RBI and 41 runs in 388 plate appearances.