Big 12 commissioner Bob Bowlsby addresses attendees during Big 12 media day, Monday, July 18, 2016, in Dallas. With expansion still an unsettled issue for the Big 12 Conference, Commissioner Bowlsby gave his annual state of the league address to open football media days. And a day later he meets with the league's board of directors. (AP Photo/Tony Gutierrez)
Big 12 commissioner Bob Bowlsby addresses attendees during Big 12 media day, Monday, July 18, 2016, in Dallas. With expansion still an unsettled issue for the Big 12 Conference, Commissioner Bowlsby gave his annual state of the league address to open football media days. And a day later he meets with the league's board of directors. (AP Photo/Tony Gutierrez)

The Big 12 is accepting resumes from expansion candidates.

The smallest Power Five conference took a significant step toward adding members Tuesday when its university presidents directed commissioner Bob Bowlsby to begin evaluating schools interested in joining.

Oklahoma president David Boren said the board of directors voted unanimously during a meeting Tuesday in Dallas that coincided with football media days to take another step toward adding to the 10-member league, but they stopped just short of committing to future expansion. When the conference ultimately makes a decision and how many schools it might add are still up in the air, Boren said.

Bowlsby said his work could be done before the end of the football season. โ€œItโ€™s possible that this could extend to our October board meeting, but itโ€™s also possible that we could have a special meeting sometime between now and then,โ€ the commissioner said.

The Big 12 has been a 10-team conference since 2012, after Nebraska, Colorado, Texas A&M and Missouri left during the last major wave of realignment and TCU and West Virginia joined.

The conference has being batting around the idea of adding more members for more than a year and begins its search with plenty of suitors. The Big 12 has been getting pitches behind the scenes for months from American Athletic Conference schools such as Cincinnati, Connecticut, Memphis, Houston and Central Florida. BYU, a football independent, has made it known it wants into a Power Five conference. Colorado State has also reached out to Big 12 leaders.

โ€œWeโ€™ve been contacted by a number of institutions, and I would imagine after this news breaks weโ€™ll be contacted again,โ€ Bowlsby said.

The Big 12 has already announced plans to reinstitute its conference championship game in 2017.

The reconstituted Big 12 in 2014 hailed its round-robin football schedule as the way to produce โ€œOne True Champion,โ€ but the slogan looked silly when it ended up with co-champions that season. Both TCU and Baylor were left out of the first College Football Playoff. After that season, the Big 12 began to reassess.

Conference leaders decided not to overreact to one yearโ€™s results and instead studied expansion, along with bringing back the title game and trying to start its own television network.

Oklahoma reached the College Football Playoff as the Big 12 champion last season, tempering some of the conferenceโ€™s nervousness. Firms hired to crunch the numbers for the Big 12 told the conference earlier this year that expanding would increase the chances of making it to the playoff and boost revenue.

Boren has been the leading advocate for expansion. He said the conference was โ€œpsychologically disadvantagedโ€ by having only 10 teams. On the other side, Texas wanted to stay at 10 โ€” and keep its own Longhorn Network in place.

In June, the Big 12 said starting a TV network was unlikely. Expansion also seemed unlikely coming out of those meetings. Even Boren was backing off.

But Monday, it was reported that ESPN will announce soon the creation of an Atlantic Coast Conference Network to start in 2019, a move expected to lead to a long extension of the conferenceโ€™s grant of media rights. The grant of rights virtually locks conference members together.

Boren acknowledged the ACC news influenced the Big 12. He said โ€œwe cannot just sit on the sidelines and not be proactive ourselves.โ€

Big 12 leaders have acknowledged that none of the schools most likely to be added are a natural fit. None is guaranteed to deliver both highly competitive teams โ€” especially football teams โ€” as well as large new markets to increase the value of future media deals.

โ€œI would say that we are looking for members that will grow over time as we grow,โ€ Bowlsby said, โ€œthat will bring stability to the conference and that have a high top end, will benefit from an affiliation with the schools that are currently in our conference.โ€

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Follow Ralph D. Russo at www.Twitter.com/ralphDrussoAP