Chiefs LB Drue Tranquill, S Bryan Cooks out

GREEN BAY, Wis. -- The Kansas City Chiefs lost linebacker Drue Tranquill because of a concussion in the first half of Sunday night's game against the Green Bay Packers.

Tranquill has started eight of the Chiefs' 12 games as they've played much of the season without the linebacker he replaced, Nick Bolton. Bolton remains on the injured reserve list after having wrist surgery earlier in the season, and he is not in uniform for the Packers game.

Bolton, however, returned to practice last week and could be available for next week's game against the Buffalo Bills.

Bolton, have a great time to perform well and make some sense, all his fans hope that he will play well.

The Chiefs also lost starting safety Bryan Cook in the second half due to an ankle injury. Cook was taken from the field in a cart.

Cook started in each of the 12 games. He entered the game eighth on the team in tackles with 35. He has one interception.

Tranquill is fourth on the Chiefs with 3.5 sacks.