Starting safety Ryan Clark was unable to board the Washington Redskins' flight to Kansas City because of a spleen injury. Clark, a heavy hitter who shines in the Redskins' defensive system, practiced all week but began to feel discomfort over the weekend and could miss several weeks, Coach Joe Gibbs said.

Washington's top cornerback, Shawn Springs, was out with a bruised shin, keeping rookie corner Carlos Rogers in the starting lineup for the 28-21 loss to Kansas City at Arrowhead Stadium on Sunday. Veteran Walt Harris returned after missing two games with a calf injury and played alongside Rogers. Safety Pierson Prioleau took Clark's starting spot, and, with three healthy cornerbacks, the Redskins waived linebacker Zak Keasey and signed defensive back Dimitri Patterson from the practice squad.

Several players suffered injuries during the game. Running back Clinton Portis, who missed some practice last week with a calf injury, aggravated the problem early, came out for a while and reentered. Portis (21 carries for 77 yards) was limping considerably after the game.

"As long as I can stand and as long as I can go, I'm going to go," Portis said of next week's home game against San Francisco.

Starting center Casey Rabach sprained his right ankle and was replaced by Cory Raymer in the second half but was optimistic about his status after the game. "I'll play next week," Rabach said.

Defensive lineman Cedric Killings, who has emerged from obscurity in recent weeks, left the game with a sprained right ankle and is unsure if he can play next week. Killings said X-rays were negative. "It's not as bad as it could have been," he said.

Arrington Sits Again

For the second straight week, three-time Pro Bowl linebacker LaVar Arrington did not get a single play on defense. Arrington was involved on two special teams plays but otherwise continues to languish on the bench. He has made big plays throughout his career, including game-changing interceptions and fumble recoveries, and the Redskins have not forced a turnover in four games.

"I have great confidence in our defensive staff," Gibbs said. "And at some point when they feel like LaVar needs to be in there, he'll be in there."

Kansas City lost the ball twice Sunday -- once on a bad snap and once when safety Sean Taylor hit running back Priest Holmes, but the Redskins did not recover either. The Redskins have nine fumble recoveries since the start of last season, second worst in the NFL, and one fumble recovery in 2005, second-worst in the NFL entering Sunday. They have forced eight fumbles and recovered just one. Linebacker Marcus Washington and cornerback Walt Harris also got their hands on a pass in the end zone early in the game but could not pick it off.

Moss, the Big-Play Boss

Wide receiver Santana Moss's 78-yard touchdown catch was the longest by a Redskin since 2001 (Rod Gardner, 85 yards). Moss has a catch of 30 or more yards in every game this season and more big plays than the entire offense mustered in 2004. Kansas City's defense has scored a defensive touchdown in 17 straight seasons, with safety Sammy Knight's fumble return his fifth career score. . . .

Rookie running back Nehemiah Broughton was active for the first time with backup runner Ladell Betts out with a groin injury. Broughton replaced Betts on the kickoff return team and returned his first kickoff for two yards. . . .

Place kicker John Hall missed his fourth straight game with a quadriceps injury, with rookie Nick Novak handling those duties.