That is because San Diego State has accepted a bid to play BYU December 20th at Qualcomm Stadium in San Diego.
The Aztecs (9-3) and Cougars (7-5) played 13 consecutive seasons from 1998-2010 until BYU left the Mountain West Conference to become an independent.
The Aztecs started this season 2-3 before closing with seven consecutive victories. SDSU tied Fresno State for the Mountain West title with 7-1 league records. Boise State can make it a three-way tie atop the MWC if the Broncos beat Nevada on Saturday.
BYU has not played in a bowl game in San Diego since 1993, when it faced Ohio State in the Holiday Bowl.
The Poinsettia Bowl will kick off at 6:00 p.m. and will be televised by ESPN.