Terrance Williams doesn't practice

IRVING, Texas -- Just as it seemed like the Dallas Cowboys were getting healthier, two offensive starters popped up on Thursday’s injury report.

Wide receiver Terrance Williams did not practice because of a bruised back and right guard Zack Martin was limited in practice with a foot strain. Both players were on the field during the open portion of practice to the media. Neither injury is considered serious and shouldn't affect their status for the game.

Mackenzy Bernadeau took at least one snap in on-air team drills at right guard. Spotted in the locker room after practice, Martin was not limping or wearing any boot or brace.

Williams is taking over for Miles Austin as the Cowboys’ No. 2 receiver opposite Dez Bryant. He caught three passes for 21 yards in the preseason. He started eight games last year with 44 catches for 736 yards and five touchdowns.

If Williams can’t play, then the Cowboys could look to rookie Devin Street to start or use slot receivers Cole Beasley or Dwayne Harris more as outside receivers.

Martin has been a starter since the Cowboys picked him in the first round in May. He started three preseason games and coach Jason Garrett gave no indication of worry regarding Martin’s status for Sunday’s game when asked about the rookie before practice.

Defensive linemen George Selvie (shoulder) and Terrell McClain (ankle) were limited for the second straight day. Quarterback Tony Romo (back) was listed as a full participant for the second straight day.