The Big Ten's continued pursuit of four Pac-12 schools is leading to concern that another round of expansion could collapse the Pac-12, industry sources tell CBS Sports. This as Big Ten commissioner Kevin Warren continues to seek an offer from Amazon, or potentially another partner, for additional Big Ten football media rights revenue.

An offer deemed substantial enough would likely convince Big Ten presidents that California, Oregon, Stanford and Washington would be valuable additions to the league from the Pac-12. That figure is believed to be less than $100 million annually.

If the Big Ten makes such a move, it would almost certainly increase the likelihood the Big 12 is able to get some combination of Arizona, Arizona State, Colorado and Utah from the Pac-12, thus crushing the Pac-12 and hanging Oregon State and Washington State out to dry.

"If that [Big Ten move] happens, I think the other [four Pac-12] schools will want to jump to our league," said a Big 12 source familiar with the situation.

Without a clear mandate, Big Ten presidents and athletic directors continue to evaluate whether expansion is "financially viable" and potential candidates are a "cultural fit," conference sources tell CBS Sports. No vote has been taken on expansion at this time.

The Big Ten completed a historic media rights deal last month worth more than $8 billion over seven years beginning in 2023. Amazon reportedly bid more for the Big Ten's 3:30 p.m. ET and primetime windows compared to other suitors. Those windows went to CBS and NBC, respectively.

If the Big Ten indeed turned down such an offer, the concerns were likely distribution and visibility. Those same concerns would be in play if the Big Ten accepted the four additional Pac-12 schools.

Industry chatter has Oregon State and Washington State moving to the Mountain West if the Pac-12 collapses. At that point, the MWC would replace the Pac-12 as the largest FBS conference completely located in the Mountain and Pacific Time Zones.