Upon Further Review: Chiefs Week 13

KANSAS CITY, Mo. -- An examination of four hot issues from the Kansas City Chiefs' 35-28 loss to the Denver Broncos:

Trouble at cornerback: After playing well in the early part of the season, rookie cornerback Marcus Cooper had his third straight poor game. Cooper missed a jam at the line against wide receiver Demaryius Thomas on one play during the third quarter, leaving Thomas alone to catch a short pass and turn it into a 77-yard gain. Cooper recovered to tackle Thomas down the field, but the play set up the touchdown that put the Broncos ahead for good. The Chiefs were determined to take away the crossing routes than San Diego repeatedly burned them on last week, but that left Cooper and the other cornerbacks vulnerable to the deep pass.

Big play from Davis: Rookie running back Knile Davis had the biggest game of his NFL career. He returned a kickoff a team-record 108 yards for a touchdown, and he also carried once for 20 yards and caught two passes for 18 yards. Davis, a third-round draft pick from Arkansas, is a logical player for the Chiefs to try in their effort to improve their offense. Playing him on offense requires the Chiefs to take Jamaal Charles out of the game, but giving Davis the ball eight to 10 times a game could be worth the effort. At 227 pounds, Davis is big enough to make his own hole and also fast enough to be a big-play threat.

Injury update: The Chiefs appear to have lost starting left tackle Branden Albert for an extended period with a left knee injury. Albert was taken from the field in the back of a motorized cart, and the Chiefs were expecting to learn from his MRI on Monday that Albert has ligament damage. He was replaced at left tackle by Donald Stephenson, who filled in for Albert last season when he missed time with back spasms. Rookie Eric Fisher, the first player taken in this year's draft, will stay for the time being at right tackle. The Chiefs may also be without tight end Anthony Fasano on Sunday against the Redskins in Washington; he has a concussion. Fasano had become a threat in the red zone. Against the Broncos he caught a touchdown for the third straight game. The only other tight end on the active roster is Sean McGrath.

Playoff primer: At 9-3, the Chiefs are only a game behind the Denver Broncos in the AFC West standings. But the Broncos in effect lead the Chiefs by a game and a half. They swept the season series from Kansas City, and would win any tiebreaker between the teams. The Chiefs will have to finish with a better record than Denver in order to win the division title.