He was twice a 5A All-State running back and was once selected as the Alabama Gatorade Player of the Year.

By graduating in January, Allen was able to attend spring practices at the University of Tennessee.

[4] His breakout came against the University of Alabama, in which he had 12 tackles, a blocked field goal and 2 pass breakups; including the game-sealing one on fourth-and-two in the fifth overtime.

Allen started the first game of the season at cornerback before moving to safety for the final 12 contests.

He also earned Walter Camp Division I-A Defensive Player of the Week honors on October 23.

Allen suffered a season-ending dislocated hip in the fifth game of the season in 2005 while tackling University of Georgia tight end Leonard Pope.

[5] Prior to the injury, he recorded 35 tackles (28 solo) with a 10-yard sack, 3 stops for losses, a forced fumble, and deflected 2 passes.