Spurlock played in nine games with the Detroit Lions before he was released Dec. 9. He averaged 22.5 yards per kick return and 6.6 yards per punt return. He has played for special teams coordinator Rich Bisaccia at the Tampa Bay Buccaneers and San Diego Chargers.
Harris has been slowed with a hamstring injury. He is averaging 30.5 yards per kick return and 14 yards per punt return on the season. The Cowboys turned to wide receivers Terrance Williams (kickoffs) and Cole Beasley (punts) to replace Harris, but neither has been able to break long returns.
The Cowboys have one spot open on their 53-man roster, which could be filled by the time they practice on Wednesday.
Linebacker Jonathan Stewart has been added to the practice squad, replacing running back George Winn. The Cowboys also added Orie Lemon to the active roster to help with the injuries to linebackers Bruce Carter, Ernie Sims, Sean Lee and Justin Durant, who was placed on injured reserve on Tuesday with a hamstring injury.
The Cowboys hope Carter, who did not play last week against the Green Bay Packers because of a hamstring injury, can play against the Redskins. Lee is likely to miss his second straight game with a sprained neck.