Willis McGahee will undergo an MRI on Monday to determine the extent of his right knee injury. "It swelled up on him," coach John Fox conceded after Sunday's win. "We'll know more Monday." The post-injury actions of Broncos trainers on the sideline suggest they don't fear a ligament tear; they were stretching McGahee out on a trainers' table and trying to get him ready to go back in. Still, he could easily have an MCL sprain or an injury like that. Because McGahee did not return and his knee swelled up, there are no guarantees he'll be available for Week 12 at Kansas City. Ronnie Hillman is second on the depth chart.