Bachman is dealing with right arm fatigue, Jack Janes of TheSportingTribune.com reports.
Bachman entered Sunday's 3-0 win over Milwaukee in the top of the eighth inning, recording one out while walking a batter before he was removed from the contest. Bachman threw nine total pitches before his departure, and manager Kurt Suzuki explained after the game that the right-handed pitcher is dealing with some "dead arm." Bachman is expected to be further evaluated, and it's currently unclear if he'll need to undergo an MRI.