Trent Williams

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Washington Redskins offensive tackle Trent Williams (71) blocks Indianapolis Colts linebacker Kavell Conner (53) as running back Alfred Morris (46) moves past during the first half of an NFL preseason football game Saturday, Aug. 25, 2012, in Landover, Md. (AP Photo/Nick Wass)

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** FILE ** Washington Redskins coach Mike Shanahan talks with offensive tackle Trent Williams (71) after practice at the team's NFL football training camp at Redskins Park on Tuesday, Aug. 14, 2012, in Ashburn, Va. (AP Photo/Alex Brandon)

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Washington Redskins offensive tackle Trent Williams (71) suffered a bone bruise against the Buffalo Bills in the first preseason game and his availability for next Saturday's game is uncertain. (AP Photo/Alex Brandon)

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Washington Redskins tight end Fred Davis (83) and offensive tackle Trent Williams (71) get focussed before the Dallas Cowboys game at FedEx Field in Landover, Md., on Sunday, November 20, 2011. (Rod Lamkey Jr./The Washington Times)

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Left tackle Trent Williams is considered a building block for the Redskins' offense, but a drug suspension has ended his season. (Preston Keres/Special to The Washington Times)

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Washington Redskins' Trent Williams celebrates the Redskins' 23-17 win over the Seattle Seahawks in an NFL football game, Sunday, Nov. 27, 2011, in Seattle. (AP Photo/Ted S. Warren)

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Washington Redskins left tackle Trent Williams has missed the last two games with a high-ankle sprain. He is questionable for Sunday's game against the San Francisco 49ers. (T.J. Kirkpatrick/The Washington Times)

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Washington Redskins tight end Fred Davis and left tackle Trent Williams reportedly violated the league's substance abuse policy by testing positive for recreational drugs and will face disciplinary action. (AP Photo/Pablo Martinez Monsivais)

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Starting left tackle Trent Williams went down with a high right ankle sprain against Philadelphia on Oct. 16, and the offensive line has been in disarray ever since. (Andrew Harnik/The Washington Times)

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T.J. KIRKPATRICK/THE WASHINGTON TIMES Left tackle Trent Williams (71) said there is less uncertainty when it comes to execution. "There's not a lot of second-guessing as there was last year coming into a new system. I feel like we're all working together right now,"

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Washington Redskins offensive tackle Trent Williams knows that he will have a tough time containing Dallas Cowboys Pro Bowl defensive end DeMarcus Ware on Monday night. (Andrew Harnik/The Washington Times)-(AP Photo/Tony Gutierrez)

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Umpire Ruben Fowler (center) talks with Washington Redskins offensive tackle Trent Williams after a first-quarter play against the Arizona Cardinals at FedEx Field in Landover, Md., on Sunday, Sept. 18, 2011. (Andrew Harnik/The Washington Times)

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Ryan Kerrigan, Barry Cofield, and Trent Williams of the Washington Redskins take down quarterback Joe Flacco of the Baltimore Ravens in preseason football at M&T Bank Stadium in Baltimore, MD, Thursday, August 25, 2011. (Andrew Harnik / The Washington Times) 91 96 72

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Ryan Kerrigan, Barry Cofield, and Trent Williams of the Washington Redskins take down quarterback Joe Flacco of the Baltimore Ravens in preseason football at M&T Bank Stadium in Baltimore, MD, Thursday, August 25, 2011. (Andrew Harnik / The Washington Times)

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Washington Redskins tackle Trent Williams (71) waits with his team to play the Pittsburg Steelers at FedEx Field in Landover, Md, Friday, August 12, 2011. (Rod Lamkey Jr./The Washington Times)