The Redskins have placed safety Chris Horton on season-ending injured reserve, the team announced on Monday.
Practice squad defensive back Anderson Russell has been called up to take Horton's place on the roster.
Horton suffered an ankle injury during the Redskins' 37-25 loss to the Detroit Lions on Oct. 31. He suffered the injury on a kick return and did not return to the game.
Horton saw action mostly on special teams in his third NFL season. He recorded 10 tackles on punt and kick coverage units.
It's the second year in a row that Horton's season ended after eight games. In 2009, he suffered a toe ligament injury that required midseason surgery.
Russell signed on to the Redskins' roster after eight weeks on the practice squad.
In four preseason games with the Redskins this year, Russell posted seven tackles, four special teams tackles and one pass defended.
Russell was a four-year starter at free safety at Ohio State the last four years. For his career, he logged 194 tackles, six interceptions, three sacks and four forced fumbles.
The Redskins also signed safety Sha'reff Rashad and wide receiver Taurus Johnson to the practice squad and released wide receiver Ray Small from the practice squad.
Rashad, a first-year player, was with the New York Giants during preseason earlier this year. He alternated between the Giants' roster and practice squad as an undrafted rookie in 2009.
He played college football at Central Florida.
Johnson, also a first-year player, has had NFL stints with the Cleveland Browns, Miami Dolphins, Detroit Lions and Kansas City Chiefs. His most recent stop was with the UFL's Hartford Colonials.
Johnson entered the NFL as an undrafted rookie with the Chiefs in 2009.
At South Florida, Johnson posted 112 receptions for 1,434 yards and 12 touchdowns. He also had 874 kickoff return yards.