Harper was injured against Oregon State last week, but he did return to the game. Tests showed the tear in the same knee he hurt last year, the school said Tuesday. He also got hurt in the third game of last season and redshirted.
This season, Harper had 160 yards and two touchdowns behind Doug Martin, who has emerged as the starting running back. Luckily, Boise State has depth at the position. Jeremy Avery will now assume a greater role with Harper out.