He won back-to-back national championships with the Cornhuskers in 1994 and 1995 playing left tackle and performing all the long snapping duties.
In the 2001–02 NFL playoffs, the offensive line, composed of Treu, Steve Wisniewski and Frank Middleton at guard, Barry Sims and Lincoln Kennedy at tackle, pulverized the New York Jets's defense with 215 yards on the ground and 287 yards in the air in a wild card game, but lost to the New England Patriots in the divisional round, the infamous Tuck rule game when Tom Brady was judged not to have fumbled.
Despite Treu's success, Robbins regained his starting position the following year, up to the day before Super Bowl XXXVII, when reported missing, then found in a manic state.
Treu started Super Bowl XXXVII in his place, but the Raiders had little success against a very strong Tampa Bay Buccaneers defense.
In November 2006, Treu suffered a ruptured quadriceps tendon against the San Diego Chargers and went on injured reserve.