Montero is dealing with back pain, which could cause him to miss the NLCS, Bruce Levine of 670 The Score reports.

EDGE Analysis

Montero dealt with back issues all season, and it seems that those problems have represented themselves at the worst possible time. It's unclear how severe the issue is, but his status for the series should become clear as Saturday's game time approaches. If the catcher is left off the roster, there's speculation that his spot would be filled by a relief pitcher.