According to this report from ESPN, the Cowboys worked out veteran cornerback Frank Walker today, and intend to sign him as soon as a roster spot is made available.
Walker worked out for the team Tuesday morning.
Walker, who will be entering his ninth season in the league, has played with New York Giants, Green Bay Packers, Baltimore Ravens and Minnesota Vikings. Walker was in training camp with the Tennessee Titans this summer but was one of the last cuts.
Walker is being brought in due to the injury bug that has affected the Cowboys secondary. CB1 Terence Newman missed the entire preseason and week one with a groin injury, but could possibly return to face the 49ers. CB2 Mike Jenkins was injured all camp as well, and then suffered two more injuries during the Jets game. His toughness can't be questioned as he willed himself through the game. CB3 Orlando Scandrick left the Jets game early in the second quarter with a ankle injury and is expected to miss 3-4 weeks. There were times when backup safety Danny McCray was getting snaps at corner behind Alan Ball and Bryan McCann.
The Cowboys could have had their eye on Walker since the final cuts, but by waiting until after week one, Walker's salary for 2011 will not be guaranteed.
[UPDATE] The Cowboys have signed Walker, and released TE Martin Rucker to make roster room. The team has also signed back FB Tony Fiammetta and released WR Laurent Rovinson [/UPDATE]
Follow the jump for some speculation about where the roster spot could come from.
Playing a bit of connect the dots, there could be a roster spot being opened up by making a move at the running back position. Fourth-year running back Tashard Choice has provided a few somewhat ominous tweets about his time with the Cowboys and things ahead in his future.
Change gone comeless than a minute ago via Echofon 
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Tashard Choice
tchoice23
Cowboy fans thanks for all the support through the years & def right now after the tough loss Sunday. I wanna say thank you and much respectless than a minute ago via TweetCaster for Android Favorite Retweet ReplyTashard Choice
tchoice23
Please note, this dot-connecting is purely speculative, and the roster opening could easily come from other places. Choice didn't have the best of games Sunday, rushing or in pass protection. UDFA Phillp Tanner best attribute from the preseason was his constant fighting for yardage but was a game day inactive. The coaching staff may be regretting not having him available for a certain 1st and goal from the 3 in Sunday's fourth quarter.
Hat Tip to @lakedog19352 for bringing the Choice tweets to my attention earlier today, and don't forget to follow us @BloggingTheBoys on Twitter.