Pecko is dealing with an undisclosed injury and is not on the Astros' wild-card series roster versus the White Sox, Brian McTaggart of MLB.com reports.
Pecko tossed three scoreless relief innings in Sunday's regular-season finale against the Athletics, but he apparently came out of the appearance with an injury. It's unclear what exactly he's dealing with, or whether he could be in play for the ALDS if the Astros advance.