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WASHINGTON (Reuters) - Donovan McNabb agreed to a long-term contract extension with the Washington Redskins two weeks after the six-time Pro Bowl quarterback was benched late in a game, the NFL team said on Monday.

Details of the deal were not disclosed but several reports said the 33-year-old contract, traded to Washington during the offseason, agreed to a five-year extension that will keep him with the Redskins through the 2015 season.

"We've been working on this for a while now, and we're obviously glad to get it done. Donovan's very happy about the situation because this is where he wanted to be all along," McNabb's agent Fletcher Smith told the Washington Post.

McNabb spent 11 seasons with Philadelphia, where he led the Eagles to five NFC championship games and one Super Bowl appearance, losing 24-21 to the New England Patriots.

A report on the NFL's official website said McNabb's new contract includes $40 million guaranteed and could be worth up to $88 million.

In eight games this season, McNabb has a 76 percent passer rating -- his lowest since his rookie season in 1999 -- and has thrown seven touchdowns and eight interceptions.

McNabb was benched in the closing minutes of 37-25 loss to the Detroit Lions on October 31 in favor of backup Rex Grossman, who Redskins coach Mike Shanahan said was more comfortable with the team's two-minute offense.

(Reporting by Simon Evans in Miami; Editing by Frank Pingue)