Heim is not in the starting lineup for Wednesday's game against the Rays.
Heim will yield to Brian Serven behind the plate after catching three of the Athletics' last four games. The 31-year-old Heim has hit 12 homers in 85 games with the A's this season, but he has been in a funk of late, slashing .175/.195/.275 with just one long ball so far in September.