Tyron Smith, DeMarco Murray on practice field

IRVING, Texas – The Cowboys are going through a short walkthrough practice Monday after a three-day break following Thanksgiving and there could be some positive news on the injury front.

Left tackle Tyron Smith was on the practice field for the no-helmet session with the first team after only being able to serve as a backup against Washington because of a high left ankle sprain.

Running back DeMarco Murray was also on the practice field and going through some on-field rehab, but he could practice some this week after missing the last six games with a sprained left foot.

Defensive end Jason Hatcher (concussion) and nose tackle Jay Ratliff (groin) were also in attendance. Hatcher got hurt in the second half vs. the Redskins and Ratliff did not play.

Centers Phil Costa (ankle) and Ryan Cook (knee) were on the field but did not look to be taking part in the session. It was the first time that Costa, who was limping noticeably, was on the field since suffering a dislocated ankle on Oct. 21 at Carolina.

Outside linebacker DeMarcus Ware was spotted in the weight room but not on the practice field during the portion of practice that was open to the media. Cornerback Orlando Scandrick, who had hand surgery last week, is not at practice.