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Posted by ESPN.com's Tim Griffin
Jason Hannan, the top national recruit at center in the 2007 recruiting class, will leave Oklahoma with hopes of transferring to another school.
Hannan came into the spring as the likely replacement for three-year starter Jon Cooper for the Sooners after playing seven games last season.
But he has been beaten out for the position by redshirt freshman Ben Habern, who now is listed as the Sooners' No. 1 player at the position.
"He's transferring -- he's leaving," senior guard Brian Simmons told the Tulsa World after Thursday's practice. "I don't know the details, but he's no longer with us any more."
Habern now is backed up at the position by former Colorado State transfer Brian Lepak.
"He was a scholarship player at Colorado State. He is a walk-on player, but I look at him as a scholarship player," Simmons told the World concerning Lepak. "He has tremendous technique. You know he's smart. He knows what he's doing."
But Hannan's departure further scrambles the turnover on the offensive line, which was expected to be one of the biggest weaknesses for the three-time defending Big 12 champions.
The Sooners will be replacing four starters along the offensive line with only Trent Williams returning from last season.
That group will be charged to protect Heisman Trophy winner Sam Bradford, who helped lead the Sooners' record-breaking offense last season. The Sooners led the nation in scoring, averaging 51.1 points per game, as they scored 60 points in five straight games late in the season.