"I'm back this week and that's all I'm gonna say," Newman tweeted late Monday night.
Newman, who suffered the injury Aug. 3, battled a nagging rib injury toward the end of the 2010 season but didn't miss any games. Newman finished with five pass breakups and three interceptions the final three weeks of the season.
The return of the 33-year-old Newman helps solidify the cornerback position, which has been in turmoil this season because of injuries to projected Week 1 starters Mike Jenkins and Newman.
Jenkins suffered a stinger early in training camp, but he recovered in time for the season opener only to sustain a hyperextended knee prior to the Week 1 loss to the New York Jets. Jenkins also suffered a bruised shoulder in that game.
Orlando Scandrick, who started in place of Newman, suffered a high-ankle sprain vs. the Jets and is out at least another two weeks.
The Cowboys signed veteran Frank Walker to the roster last week to fill a void at corner. He got more snaps vs. the 49ers than second-year corner Bryan McCann, who only returned kickoffs in the Week 2 victory over San Francisco.
Newman looked good running at full speed during some rehab sessions last week, but the Cowboys held him out as a precaution.
Calvin Watkins covers the Cowboys for ESPNDallas.com.