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Donald Brown back on the practice field

SAN DIEGO -- Running back Donald Brown missed the past three weeks because he had not passed the NFL protocol for returning to the field from a concussion.

But Brown was finally back on the field for the San Diego Chargers on Wednesday, giving the team some added depth at running back.

However, fellow running back Ryan Mathews remains unable to practice fully with the rest of the team. Mathews, who missed six games with a MCL knee sprain, continues to work on his own.

Initial reports had Mathews returning in four to six weeks from his knee issue.

After sitting out the loss to Denver on Thursday with a concussion, cornerback Brandon Flowers has still not cleared the NFL protocol process in order to return to practice.

Inside linebacker Manti Te'o, out for the past five games with a broken foot, remains out as well, along with rookie edge rusher Jeremiah Attaochu, who has missed four games this season with a lingering hamstring injury.

Outside linebacker Dwight Freeney (rest) and center Rich Ohrnberger (back) also were not out practicing.

Along with Brown, outside linebacker Cordarro Law (ankle) and cornerback Steve Williams (groin) returned to practice on Wednesday.

Linebacker Melvin Ingram is on the injured reserve/designated to return with a hip issue. The earliest Ingram can return to the field is after the bye week against Oakland on Nov. 16. Ingram appears on track to meet that goal.