ENGLEWOOD, Colo. — Denver Broncos rookie running back Ryan Torain is expected to miss about three months after breaking a bone in his left elbow.

Broncos coach Mike Shanahan announced today that Torain would need surgery. Asked if the injury was a blow to the organization, he did not respond.

Andre Hall, one of the Broncos' three remaining healthy running backs, said the loss of Torain "messes things up."

"Ryan had the big body and the team had a short-yardage package in for him," he said. "The rest of us are going to have to step it up."

Besides Hall, the Broncos have Selvin Young and Anthony Aldridge at running back.

Torain, a fifth-round draft pick out of Arizona State, was flipped while rushing during 9-on-7 drills on Wednesday.

He was hit by linebackers Jordan Beck and Spencer Larsen and safety Roderick Rogers, and he put out his left arm to brace his fall.

"When I saw him go down, it hurt, but I was hoping he just got bumped up," Hall said, "that he would be all right, miss a few plays and come back in the third or fourth periods of practice."

Instead, Torain collapsed to the grass behind the goal posts as team doctors were leading him off the field, and he remained down for several minutes. He eventually was taken off the field in a cart.

"It is obviously more serious than what was first thought," Shanahan said.

Shanahan wouldn't speculate on how the missed practice time would affect Torain's ability to make the team.

"It depends on the recovery," Shanahan said. "We just have to see how the operation goes and see what the doctors say."