Winfrey exited Sunday's practice with a lower back injury, Todd Archer of ESPN.com reports.

EDGE Analysis

Winfrey had to be helped off the practice field early during the practice session Sunday. The 25-year-old was able to make Dallas' 53-man roster following a strong training camp, and he's slated to work in a rotational role along the team's defensive line if he's able to move past the back injury.