IRVING, Texas -- The Dallas Cowboys will be without wide receiver Miles Austin for Sunday's game against the San Diego Chargers.

Austin was ruled out after missing three days of practice with a strained hamstring suffered in the third quarter of last week's win against the St. Louis Rams. Because of Austin's history of hamstring injuries, the Cowboys will be conservative with him, but coach Jason Garrett said it is not as severe as some of the strains the receiver suffered in previous seasons.

After practicing Friday, receiver Dwayne Harris (hip) said he will play Sunday even though he was listed as questionable.

"Monday I couldn't even move," Harris said. "It feels so much better. I'm not worried about it. I played the whole game Sunday with the same thing."

Defensive end DeMarcus Ware (stinger), cornerback Morris Claiborne (shoulder) and linebacker Ernie Sims (groin) are probable.

Although the Cowboys will go with a committee approach to replace Austin, rookie Terrance Williams will get the bulk of the work. Williams has five catches for 60 yards through three games, but he had a mix-up with Tony Romo in the Week 1 win against the New York Giants that led to the quarterback's only interception so far this season.

Romo's message to Williams this week?

"Just continue playing," Williams said. "If I mess up, just like mess up going 100 mph, not going 50 and thinking. Just play fast and just continue to progress."