Guyton (concussion) has been ruled out for Sunday's game against the Jets, Todd Archer of ESPN.com reports.
Guyton entered concussion protocol following the Cowboys' 40-40 tie to the Packers this past Sunday. Nate Thomas will likely start at left tackle against the Jets in Guyton's absence. Week 6 against the Panthers on Sunday, Oct. 12 will be Guyton's next opportunity to play.