Dwayne Thomas, LSU’s starting nickelback, is expected to miss the rest of the 2014 season with a torn anterior cruciate ligament in his right knee, a source confirmed to The Advocate on Monday.

Thomas was injured during the second quarter of LSU’s 63-7 win over New Mexico State. Coach Les Miles on Monday would not reveal details of Thomas’ injury or his status.

While blitzing the quarterback, Thomas made a cutback and his knee twisted. He had to be helped off of the field and needed crutches to get into the locker room.

Thomas, a 6-foot, 180-pound sophomore from New Orleans, has served as the Tigers’ fifth defensive back in the nickel formation. He’s a key cog, too, in LSU’s Mustang package – a formation that includes six defensive backs.

Thomas is fifth on the team with 24 tackles and has 2.5 tackles for loss. He’s the primary blitz guy off of the edge in the Mustang.

True freshman Jamal Adams is expected to replace Thomas. Adams, a highly touted Texas native, has rotated some with the starting safeties.

Asked Monday who would play in Thomas’ possible absence, Miles mentioned Adams and true freshman cornerback Ed Paris.

Ross Dellenger contributed to this report.