The Facts: Williams left Friday's practice and was being tested for a possible concussion. If Williams, who collided with cornerback Brandon Underwood during a passing drill, fails the baseline test, he will miss the Hall of Fame game against the Miami Dolphins on Sunday.

Diehards Line: As ESPN.com's Calvin Watkins reminded readers, Williams has to be symptom-free for a certain amount of days before being cleared to play. The Cowboys' second preseason game arrives quickly -- Friday, Aug. 9 at Oakland -- and he could miss that game as well. Watkins went on to note it's a tough blow for the third-round pick because he was the third receiver on the depth chart. With Williams missing the last hour of practice, Cole Beasley replaced him as the slot receiver and Dwayne Harris took over as the No. 3 receiver on the depth chart.