Spurlock has now been with seven NFL teams and participated in nine games with the Detroit Lions this season. He's averaged 24.5 yards per kick return and nine yards per punt return in his career.
Williams had replaced Harris on kick returns but when he suffered a hamstring injury against Green Bay, it forced the Cowboys to make a roster move, made official on Wednesday.
"He also helps us with our depth at receiver," coach Jason Garrett said of Spurlock. "So those are all the factors involved, the people involved, and we’ll just evaluate as the week goes on."
If Harris and Williams are unavailable, Cole Beasley will continue his duties as the punt returner and Spurlock will move into the kick returner role.
On the season, Harris is averaging 30.5 yards per kick return, second in the NFL. Harris is also averaging 14 yards per punt return.
The Cowboys have missed Harris' special teams abilities to calmly field punts and kicks and make plays. Williams had his moments on returns, but he fumbled the opening kickoff against Oakland and made a questionable return against the Packers in the third quarter where he returned a kick 24-yards after fielding the kick nine-yards deep in the end zone.
"Dwayne has done a heck of a job for us as a return guy," Garrett said. "Dwayne is a very good special teams player. He’s a very good cover guy and he’s made a number of plays as a return guy, both punts and kickoffs and that certainly helps our team."