"We get everybody's best shot week after week," said Boise State coach Chris Petersen in trying to downplay what should be another rout. "There's no hiding. Everybody brings their best against us."

It's clearly a favorable matchup for the Broncos (10-0, 6-0 Western Athletic Conference) against the Aggies (1-9, 1-5), especially in Bronco Stadium where they've won 50 of the last 52 games.

But the Broncos, No. 13 in The Associated Press poll, could have some distractions.

They almost certainly won't have running back Ian Johnson, the nation's leader in touchdowns with 21. Johnson spent five days in a San Jose, Calif., hospital with a partially collapsed left lung sustained in Saturday's 23-20 win against San Jose State. He was discharged Thursday, according to the hospital.

And in the last week Boise State climbed to No. 12 in the Bowl Championship Series standings, putting it in position to become the second team from a non-BCS conference to automatically qualify for one of the big-money bowl games.

Saturday's contest also marks Senior Day and likely the final game on the distinctive blue turf for Broncos seniors who, for those who red-shirted, helped compile a 55-7 record during their careers that included an undefeated regular season in 2004.

"I think it's going to be a pretty emotional day," said senior safety Gerald Alexander.

The Broncos lead second-place Hawaii by a half-game in the WAC and can capture at least a share of the league title with a win.

Johnson carried 29 times for 149 yards and a touchdown against San Jose State and was taken to the hospital immediately after the game with back pain. He ranks fourth in the nation with 146.6 yards rushing per game.

Boise State, one of four undefeated Division 1-A football teams remaining, hasn't made any statements about Johnson's status for Saturday. But his teammates expect either Vinny Perretta, a 5-9, 194-pound sophomore, or Brett Denton, a 5-9, 191-pound senior, to be in the backfield.

"I prepare for every game the same," said Denton. "Who knows what could happen in a game. It is football. I always want to play, and if I get a chance to play more, I'll be ready for it."

What he'll face is a Utah State defense that gives up 425 yards a game, 185 of them rushing. Boise State averages 412 yards a game on offense.