Seigler was diagnosed with a right trapezius contusion following his removal from Wednesday's game against the White Sox, Ian Browne of MLB.com reports.
Seigler initially seemed to have suffered a head injury after sliding into Kyle Teel's knee guard during a play at the plate in the third inning, though it appears his upper back took most of the damage. Seigler can be considered day-to-day for the time being.