Nebraska football player Andy Christensen was ordered Friday to serve at least three weeks in jail for criminal mischief and resisting arrest.

Those charges stem from a sexual assault case the 22-year-old Christensen was found not guilty of in September. He had been accused of reaching under a 23-year-old woman's skirt and molesting her at the Brass Rail bar in Lincoln last March.

Christensen did plead guilty to the two misdemeanors. He aggressively resisted efforts to handcuff him and place him in a police vehicle, kicking the vehicle and denting it. He was placed in a security chair at the jail to control his behavior.

Christensen had been suspended from the football team after his arrest. He was reinstated after September's court ruling.

Lancaster County District Court Judge John Colborn ruled Christensen's sentence would begin on December 20th so the senior could finish the fall semester.

He must also serve 15 months probation, followed by another 30 days in jail that could be waived, along with fines and restitution.

Christensen started three games at left guard as a junior last season before suffering a season-ending knee injury. He started eight of 14 games as a sophomore and was a first-team academic All-Big 12 selection in 2006. Christensen is a graduate of Bennington High School.