If the University of Oklahoma is to stay in the Big 12, it will do so only if the conference adds regulations on ESPN's Longhorn Network and ousts commissioner Dan Beebe, according to a report in The Oklahoman Tuesday.

The Oklahoman, citing a high-ranking Big 12 official, reported Oklahoma president David Boren said Monday the school would decide between applying for the Pac-12 or staying in the Big 12. The source stressed that reforms would be necessary for Oklahoma to remain in the Big 12.

"It's going to take major, major reforms," the source said. "We'd have to have an interim commissioner."

According to the source, the Big 12 presidents don't believe Beebe handled the departures of Nebraska and Texas A&M adequately. The Big 12 has lost three members in the last 15 months, and, according to the source, "the relationships were so bad (with) the commissioner."

According to the Big 12 bylaws, a majority vote among the member schools is needed to oust the commissioner.

Beebe received an extension through June 2015 from the Big 12 in November 2010. University of Missouri chancellor Brady Deaton, chairman of the league's board of directors, said Beebe had been "an outstanding leader" during challenging times.

Beebe received a raise from $661,000 to $997,000 in 2009 before the Big 12's first near breakup.

Oklahoma has also demanded that Texas modify some of its plans for the Longhorn Network. Big 12 members were angered by the network's agreement with Fox Sports to move a conference game to the Longhorn Network and its decision to show high school highlights after the Big 12 voted to keep televised high school games off school-branded networks.

The source told the Oklahoman that a move by Oklahoma and Oklahoma State to the Pac-12 wasn't inevitable.

The University of Oklahoma's board of regents and its counterpart at Texas granted their school presidents Monday the authority to take action regarding conference realignment.

The moves clear the way for the Sooners and Longhorns to apply formally to the Pac-12, with whom they have been undergoing discussions in recent days on how to make the schools' addition to the conference work.

After the regents meeting had adjourned, Boren admitted he's had "very warm and constructive discussions" with Pac-12 officials, but wouldn't say when the Sooners might apply for conference membership.

The SEC has informally agreed to add Missouri to the conference and move Auburn to the SEC East, according to a report in the Birmingham News.

The News, citing two sources familiar with the discussions, said a majority of SEC presidents have endorsed the agreement, though a timetable for the move remains unknown. Missouri would become the conference's 14th member, as the SEC already plans to add Texas A&M as the 13th member.

Earlier Tuesday, the Kansas City Star reported that the SEC was going to offer Missouri a spot in the conference, and would wait until the Big 12 dust settled for an answer. The Star cited a Mizzou booster who spoke directly to a school official. Another source told The Star on Tuesday that an Oklahoma official had said the SEC is interested in Missouri, the Star reported.

But the SEC said Tuesday afternoon that the only invitation it had issued was to Texas A&M.

BIRMINGHAM, Ala. -- Texas A&M is set to join the Southeastern Conference, the league said Sunday, apparently signaling that legal hurdles have been cleared for the Aggies to leave the Big 12.

The SEC announced Sunday that the move will be effective next July, and said Texas A&M will participate in all sports during the 2012-13 academic year. That gives the SEC 13 members and its first addition since South Carolina and Arkansas joined in 1992.

The Aggies' defection from the Big 12 had been held up by the possibility of legal action from Baylor and other members, who would not waive their rights to sue the school and the SEC.

The statement released by the SEC did not mention that situation, and spokesman Charles Bloom said he could not comment.

A source told ESPN's Joe Schad that Texas A&M's negotiation of an exit fee with the Big 12 "will now begin in earnest."

The SEC's announcement said that Texas A&M beginning play in the conference next year is "unconditional," sources told Schad.

If any institution, such as Baylor, files litigation it would be dealt with at that time.

Baylor's decision not to waive its right to sue the SEC or Texas A&M was based in large part, however, on a desire to get the remaining nine schools to commit, which Big 12 leadership says is a goal they have recently moved closer toward.

SEC presidents and chancellors voted in favor of the move on Sept. 6.

"We are excited to begin competition in the nation's premier athletic conference," Texas A&M President R. Bowen Loftin said in the statement.

It's unclear if the SEC will add a 14th member for next season or go with unbalanced divisions. Other rumored possibilities have included the Big 12's Missouri and West Virginia of the Big East.

Texas A&M initiated the courtship in July, unhappy with rival Texas' ESPN-operated Longhorn Network and setting off a tumultuous period for the Big 12.

The Aggies, who play Arkansas Saturday in Arlington, give the SEC entry into major TV markets such as Houston and Dallas.

"Texas A&M is a nationally prominent institution on and off the field and a great fit for the SEC tradition of excellence -- athletically, academically and culturally," Commissioner Mike Slive said in the statement.

Slive, Loftin and others will hold a news conference Monday evening in College Station, Texas.

Four Big 12 teams -- Oklahoma, Texas, Texas Tech and Oklahoma State -- had explored moving to the Pac-12, which decided not to expand this year.

Oklahoma President David Boren said the nine remaining schools besides Texas A&M agreed last week to give a six-year grant of their first- and second-tier television rights to the Big 12 for the next six years. That means all revenue from the top television games -- shown currently on networks owned by ABC/ESPN and Fox -- would continue to go to the Big 12 even if a school bolts to another league.

That deal, however, had not been finalized.

The Big 12 also ousted Commissioner Dan Beebe last week after five years and replaced him with former Big Eight Commissioner Chuck Neinas on an interim basis.

A&M's official departure from the Big 12 was considered the next step needed to determine where this round of conference realignment is headed.

Once that is done, the SEC can decide on a 14th member, if it wants one and the Big 12 can replace the Aggies.