Yarbrough isn't on the Rays' ALDS roster, Neil Solondz of the Rays Radio Network reports.
Yarbrough will be available in an emergency situation as part of the team's taxi squad, but he was a notable exclusion from the roster following a slow finish to the season. The southpaw posted a 9.00 ERA and 1.57 WHIP in 21 innings across his final five starts of the year, and it's not yet clear whether he'll return if the Rays advance to the ALCS.