The Redskins suffered injuries to their secondary in Sunday's season finale against the Dallas Cowboys when cornerback Dashaun Phillips injured his neck and safety Kyshoen Jarrett sustained nerve damage to his arm.
Jarrett, who has already been ruled out for Sunday's wild-card playoff game against the Green Bay Packers, was placed on injured reserve Tuesday. Phillips, who was diagnosed with a stinger, has a chance to practice Wednesday.
Williams was a seventh-round pick of the Tennessee Titans in 2009. He played in four games as a rookie before he was cut the following year. He went on to play four seasons for the Baltimore Ravens and two for the Philadelphia Eagles before signing a three-year, $18 million deal ($7 million guaranteed) with the Seattle Seahawks last offseason.
Williams, 31, was cut by Seattle after playing in 10 games. Seahawks coach Pete Carroll benched him during a Week 11 matchup against the San Francisco 49ers, and Williams was replaced by DeShawn Shead and was inactive the next two games before he was released in December.
Williams regularly has made headlines for his outspoken nature. With the Eagles, he said that coach Chip Kelly's practice tempo was wearing down his players and called the Patriots "cheaters" before a scheduled joint practice with New England. After he was cut by the Eagles in March and signed with the Seahawks, he said in a radio interview that Kelly's team was "outcoached" in 2014.