Oklahoma will be without star defensive tackle Charles Walker against Clemson in Thursday's College Football Playoff semifinal due to a concussion. 

According to Mark Schlabach of ESPN, Walker suffered the injury during practice Monday, and his status for a potential championship game if the Sooners win Thursday is uncertain at this point. 

Continue for updates. 

Impact of Walker's Absence

Thursday, Dec. 31

Clemson has one of the nation's best offenses, averaging 35.7 points per game coming into the Orange Bowl. Quarter...

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