Although Washington Redskins defensive end Charles Mann took himself out of the lineup after feeling a burning sensation in his sore right knee during pregame warmups yesterday, he promised to be available for Philadelphia when the playoffs begin next week.

"You couldn't keep me out of that one," he said.

Mann's knee remains a concern for the Redskins. He said last week that the knee will be "cleaned out" after the season, but for now it's a matter of playing with discomfort.

"I was set to start," he said. "But when I jogged on the field, I felt a burning and decided it would be stupid to try it if it was already bothering me that quickly."

The Redskins also hope defensive end Markus Koch, who has missed two straight games, will be ready for the Eagles. There's also a chance that defensive tackle Eric Williams (foot injury) could play this week. He will be evaluated at midweek.

Three players were hurt in yesterday's 29-14 victory over Buffalo, but all of them are expected to play next week. They are Jim Lachey (elbow), Todd Bowles (knee) and Gary Clark (knee).Curiouser and Curiouser

The Redskins were forced to respond to more stories about Coach Joe Gibbs and his contract after NBC's Will McDonough reported yesterday that he had agreed to a new deal.

"Not a shred of truth in the rumor," Redskins owner Jack Kent Cooke said. "Where these people get these stories is beyond me. They become more curiouser and more curiouser and more curiouser."

Gibbs has said that his contract is between himself and Cooke, "and it's one of the few things I've managed to keep secret around here."

"There's nothing new about my contract situation," Gibbs said after the game, according to a United Press International report. "It's between me and Mr. Cooke and I feel good about that." McDonough, a Boston Globe reporter, said in off-camera comments that he was told of the agreement this weekend by a source close to Gibbs.

However, Gibbs said several weeks ago that his contract isn't up after this season and that he doesn't intend to leave the Redskins. It's believed that Gibbs is in either the first or second year of a three-year extension.Moving Up . . . and Back

Gary Clark's first catch of the day, a 16-yarder in the first quarter, pushed him past Bobby Mitchell and into third place on the team's all-time receiving yardage list. But he fell one yard behind Mitchell (6,491) when he lost 10 yards on his next catch. . . .

Lohmiller finished as the NFC's leading scorer. His 131 points and 30 field goals are career highs.

He's the third Redskin to kick five field goals in a game. Curt Knight did it three times. Mark Moseley did it last -- in 1980.