ASHBURN, Va. (AP) -- Needing to replace two key special teamers, the Washington Redskins signed free-agent linebacker Josh Hull and long snapper Kyle Nelson.
The Redskins also signed safety Trenton Robinson on Tuesday, while waiving safety Jordan Pugh and putting linebacker Bryan Kehl and long snapper Nick Sundberg on injured reserve.
Hull was drafted in the seventh round in 2010 by the Rams, who released him this August. He's played in 28 NFL games, making one start.
Nelson has been with six teams since 2011, most recently appearing in San Diego's final six games last season.
Robinson was a sixth-round draft pick in 2012 and has appeared in three NFL games with the 49ers. San Francisco released him in August; Philadelphia then signed him to its practice squad but released him a week ago.
In Washington's 31-16 loss at the Dallas Cowboys on Sunday night, Kehl tore the ACL in his left knee, and Sundberg tore the meniscus in his right knee.
Kehl was signed in March to soften the blow when Pro Bowl special teams player Lorenzo Alexander left as a free agent and signed with Arizona. Kehl leads the Redskins in special teams tackles.
Sundberg signed a four-year deal in the offseason to remain with the Redskins, but this is the second consecutive year he's had a major injury. He missed much of 2012 with a broken left arm.
Washington (1-4) hosts Chicago (4-2) on Sunday.