Blackmon will have a screw inserted in his wrist next week in Birmingham. He has played sparingly since sustaining the injury in the third game of the season.
Josh Bynes has been starting at middle linebacker in Blackmon's absence.
Blackmon has 21 tackles and has missed 12 of the Tigers' 33 games during his career because of either injury or suspension.
He is the eighth Auburn player to sustain a season-ending injury this season.
The others include defensive back Aairon Savage, receiver Phillip Pierre-Louis and offensive lineman Chaz Ramsey.
Southern Miss runningback Damion Fletcher, center, is tackled by Auburn defenders, from left, Antonio Coleman, Mike Blanc and Tray Blackmon in the first half of their NCAA college football game on Sept. 6, 2008 in Auburn, Ala. / photo: Associated Pre
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