The Big 12 is involved in deep discussions to add multiple Pac-12 programs as a way to shore up its membership in the wake of the USC and UCLA defection to the Big Ten, sources tell CBS Sports. At least four teams are being considered with the potential for the Big 12 to add more as realignment continues to shake out.

Boise State and Memphis are among the schools being discussed by the Big 12 as it considers a possible second round of expansion, sources tell CBS Sports. Big 12 sources have said publicly and privately in recent days that the conference is not necessarily done expanding despite formally inviting BYU, Cincinnati, Houston and UCF on Friday.

The Big 12 is expanding and doing it at warp speed. Less than six weeks after Texas and Oklahoma announced their impending departure to the SEC, the league is poised to add four new members in a process that could culminate in one week’s time.

College conference expansion and realignment speculation continues to swirl, with the Big 12 right in the middle of the chatter amid reports that the conference is interested in adding Arizona, Arizona State, Utah and Colorado to its member schools. How could the conference look if it did in fact add the Pac-12's Four Corners schools?