EUGENE, Ore. (AP) — A disappointing loss at Nebraska, questions about those two-point conversions and injuries to key players have the Oregon Ducks facing adversity with Pac-12 play at hand.

Oregon fell out of The Associated Press Top 25 following the 35-32 loss at Memorial Stadium on Saturday. Now 2-1, the Ducks host Colorado (2-1) in their Pac-12 opener this weekend.

The loss was costly. It was revealed Monday that receiver and Olympic hurdler Devon Allen had suffered a season-ending injury to his left knee. The team also says left tackle Tyrell Crosby is out for the season because of a broken foot that required surgery.

With Allen's injury, the Ducks lose tremendous speed at receiver. The junior won the NCAA championship in the 110-meter hurdles then earned a spot in the Rio Games at the Olympic Trials in Eugene this July. He finished fifth in Rio last month.