 In football, he played across the defensive line in his career, starting games at both defensive end and tackle.After appearing in five games as a freshman in 1999, Warren started the last eight games of his sophomore season in 2000, finishing the year with 38 tackles and five sacks while leading the team in tackles for a loss.He moved to defensive tackle in 2001, starting seven games there en route to an All-Big 12 Conference first-team selection.