ARLINGTON, Texas — Cowboys receiver Roy Williams has only a bruised shoulder from a hard collision with a teammate, yet still may not play against the San Francisco 49ers tonight.

"We'll kind of see how that restricts him as far as the next few days, this weekend and into next week," team owner Jerry Jones said Friday during his radio show. "We'll just play it by ear. He had good movement, good strength in it today, but he was sore."

Williams banged into cornerback Orlando Scandrick while going for a pass near the goal line during a practice at the team's new stadium Thursday night. X-rays showed no broken bones.

The Cowboys could play it safe and keep Williams out of the preseason finale next Friday in Minnesota. Starters don't play much in the last preseason game anyway and Dallas needs to make sure Williams is at full strength for the opener Sept. 13 at Tampa Bay. After all, he has the crucial role of replacing Terrell Owens as the team's No. 1 receiver.

Although Jones couldn't put a timetable on Williams' return, he said the receiver "will be back real quick ... certainly not enough time to warrant bringing somebody in."

The Cowboys were wearing helmets but not pads in their workout Thursday night. Williams was slow to get up, then left the field angry, likely because of how many times he's been nicked up by Scandrick. During training camp, the second-year cornerback — who is trying to earn a starting job — hit Williams hard enough to send his helmet flying and the two tangled on a play that ended with Williams spraining his wrist.

Jones said Scandrick didn't do anything wrong.

"The ball was thrown up," he said. "They were going for it."

Receiver Sam Hurd hasn't practiced all week because of a bruised leg, making it unlikely that he'll play against the 49ers.