"The Big Ten has begun exploratory discussions about expanding membership to 18 or even 20 teams, industry sources have told Yahoo Sports. The schools being considered are Oregon and Washington if the league adds two schools, and Cal and Stanford if it wants to move to 20. All four institutions are currently members of the Pac-12."
Sources: Big Ten has begun preliminary talks to potentially add Oregon, Washington, Cal and Stanford
The Big Ten has been reluctant to move to 20 teams, even if many in college athletics believe expansive superconferences are inevitable.
sports.yahoo.com