The second-year player out of Texas takes the roster spot of Geno Atkins, the All-Pro who was placed on injured reserve Monday with a season-ending knee injury.

--San Francisco 49ers wide receiver Michael Crabtree was cleared to practice for the first time since suffering a torn Achilles tendon during offseason workouts.

The fifth-year wideout is currently on the physically unable to perform list, and the team now has a 21-day window to evaluate whether to activate Crabtree or place him on season-ending injured reserve.

--The Denver Broncos activated center J.D. Walton and placed guard John Moffitt on the reserve/left squad list for not reporting from the bye week, the team announced. Moffitt later said he decided to quit playing football.

Moffitt, 27, told Sports Radio 950 KJR that he is giving up football and that he already informed the Broncos he was calling it a career.

--New England Patriots wide receiver Austin Collie was released, and the team signed former Baltimore Ravens wide receiver LaQuan Williams.

Collie was signed last month and appeared in four games for the Patriots, catching three passes for 34 yards. He left Sunday's game against the Pittsburgh Steelers after suffering a knee injury.

--The Carolina Panthers signed free agent guard/center Geoff Hangartner, the team announced. Backup offensive lineman Jeff Byers was placed on injured reserve with a foot injury. Byers underwent season-ending Lisfranc surgery on his left foot Monday.

--The Kansas City Chiefs activated defensive back Sanders Commings from injured reserve and waived safety Bradley McDougald, the team announced.

Commings, a fifth-round pick from Georgia this year, broke his collarbone at the team's first practice of training camp.

--The Pittsburgh Steelers signed cornerback DeMarcus Van Dyke and released cornerback Isaiah Green, the team announced.

--The Bears placed wide receiver Joe Anderson on injured reserve with an abdominal and groin injury, the team announced. Anderson, 24, appeared in six games this season and made one special teams tackle.