Irving, TX (My Sportsbook) - The Dallas Cowboys' rookie class took a major blow on Monday, as head coach Wade Phillips announced that linebacker Jason Williams and safety Michael Hamlin will miss 4-6 weeks of action due to injuries.

Williams, the team's first pick in this year's draft and a third-round selection, suffered a high ankle sprain versus the 49ers in a preseason affair last Saturday. Hamlin, a fifth-round pick, broke his wrist in the contest.

Phillips doesn't have any plans of placing either player on IR.