The Pac-12 announced Tuesday that it won't expand, ending weeks of speculation that the conference might add as many as four teams.
Because of instability in the Big 12, Oklahoma and Oklahoma State had expressed interest in joining the Pac-12.
Texas was also considering a move, but the existence of the Longhorn Network was a complicating factor. Texas Tech would have joined Texas as the 16th team
The Pac-12 presidents and chancellors were content with the league's structure -- not to mention the $3 billion television contract with ESPN and Fox that starts next summer and the league's wholly owned national and regional networks.
"After careful review, we have determined that it is in the best interests of our member institutions, student-athletes and fans to remain a 12-team conference," commissioner Larry Scott said in a statement released by the league.
"While we have great respect for all of the institutions that have contacted us, and certain expansion proposals were financially attractive, we have a strong conference structure and culture of equality that we are committed to preserve.
"With new landmark TV agreements and plans to launch our innovative television networks, we are going to focus solely on these great assets, our strong heritage and the bright future in front of us."
"Somebody at OU laid all their cards on the table," one of the school sources said. "And it's the issues and concessions we've heard over and over before."
The presidents and athletic directors from the Big East football schools met for three hours at a Manhattan hotel Tuesday.
Marinatto says each member pledged to remain in the conference and the league is aggressively searching for replacements for Pittsburgh and Syracuse. He says the non-football members also are on board.
Representatives for the NBA and players will meet twice this week. Staffs from both sides will meet Wednesday without leadership from either side, a person with knowledge of the plans said. Commissioner David Stern, deputy commissioner Adam Silver, union executive director Billy Hunter, president Derek Fisher of the Lakers and other top negotiators would rejoin the labor talks for a meeting Thursday.
The Dallas Morning News and the Associated Press contributed to this report.