ENGLEWOOD, COLO. ? Travis Henry returned to the field Friday for practice amid uncertainty over his future with the Denver Broncos.

Henry, the NFL’s leading rusher, is trying to prevent the league from suspending him over the results of a drug test, according to federal court records. He said he couldn’t comment on the case on the advice of his attorney.

“If you got any football questions, I’m more than willing to answer,” Henry said.

Henry plans to play Sunday against San Diego. Broncos coach Mike Shanahan thought that was a strong possibility, as long as Henry’s injured right ankle and knee are up to it.

Henry, listed as questionable on the injury report, was back at practice Friday for the first time since injuring his leg against Indianapolis last week.

“If there is no setback with where he’s at, he will play,” Shanahan said.

However, Broncos receiver Javon Walker will not play against the Chargers, Shanahan said. Walker still has swelling in his surgically repaired right knee. He thought he’d be ready for the Pittsburgh game Oct. 21. The Broncos have a bye week after San Diego.

“Sometimes the best thing for healing is not treatment but just time,” Walker said.