Brandon Meriweather’s season for the Washington Redskins lasted only one game. The safety suffered a torn anterior cruciate ligament in his right knee during Sunday’s triumph over the Philadelphia Eagles and will be sidelined for the remainder of the season.

Coach Mike Shanahan made the announcement Monday, saying that Meriweather will undergo surgery within a couple weeks and faces a recovery period of approximately six months.

Meriweather had an interception Sunday in his first game of the season. He had been sidelined since the preseason by an injury to his left knee that he aggravated twice.

“He played great,” Shanahan said. “You can’t ask a guy to play any better than he played.”

Meriweather hurt his knee without being hit while defending a third-quarter running play. He was not available to comment Monday but wrote on Twitter: “I want to start off by saying I’m sorry to all the [R]edskins fan[s]. Y’all are the best. But this was a bad season for me.”

Meriweather was able to walk off the field under his own power Sunday and Shanahan said after the game he hoped the injury wasn’t too serious. But an MRI exam revealed the ligament tear.

“He wanted to go back in the game,” Shanahan said Monday. “He talked to me after the game. He felt great. He said, ‘Don’t worry about me, coach. I’m ready to go. A little sprain. I could have went in there and finished the game.’ And obviously with the score the way it was, we weren’t going to take a chance and put him back in.”

The injury sidelines the player whom the Redskins hoped would solidify their pass defense for the rest of the season.

“I think he brought a spark to the whole team — amazing player and it showed in his play,” Redskins defensive end Stephen Bowen said in a conference call with reporters Monday, before Shanahan’s announcement about the severity of Meriweather’s injury. “I mean, it spoke for itself. I don’t really have to talk about it. Everybody saw how much of an impact he makes.”

Meriweather was signed in the offseason as a free agent and his contract in effect is worth $6 million over two seasons. After he hurt his left knee in the second preseason game, the Redskins believed he would return for the season opener. Instead, he re-injured his knee in practice six days before the season’s first game, then hurt it again during a pre-game collision with wide receiver Aldrick Robinson prior to the Redskins’ game at Tampa on Sept. 30.

“I promise that I’ll be back next [year] better then ever,” Meriweather wrote on Twitter. “Hard work pays off. God had something different for me this year. So see y’all next” year.

Garcon out to make impact

Garcon seeks greater impact...Wide receiver Pierre Garcon said Monday he hopes to make a more significant contribution to the Redskins’ offense in the season’s remaining games.

Garcon had three catches for only five yards in Sunday’s victory over the Philadelphia Eagles. He is playing with a torn ligament near the second toe in his right foot and had missed the Redskins’ previous four games.

“Hopefully what I did the last game is not what I do for the rest of the year,” Garcon said in a conference call with reporters Monday afternoon. “The foot is going to get better over time. Just every day it’s getting better. Hopefully it will continue to get better to where I can help out more. But hopefully that’s not my role for the rest of the year.”

Garcon said he suffered “no setbacks” Sunday.

Redskins Coach Mike Shanahan said he was impressed by Garcon’s ability to run routes against the Eagles and hopes that Garcon will be ready for Thursday’s game in Dallas. The Thanksgiving game could be challenging for Garcon because of the quick turnaround and the artificial turf playing surface.

“The big question now is ‘can he do it on the turf,’ where it’s a little bit harder, a little bit tougher to run on for a guy like him going through the type of pain he’s dealing with in the bottom of his foot,” Shanahan said.