Dallas Cowboys running back Felix Jones missed a second straight day of practice Wednesday due to tightness in his hamstring.
The oft-injured Jones had just reclaimed his starting job last week following a season-ending injury to rookie DeMarco Murray.
Jones had his third 100-yard game of the season in Saturday's 31-15 win at Tampa Bay, rushing 22 times for 108 yards while grabbing three passes for 23 yards.
The Cowboys have only two other backs on the roster - Sammy Morris and Chauncey Washington. Morris was signed last week and had 12 carries for 53 yards against the Bucs.
Dallas has a huge matchup Saturday against NFC East rival Philadelphia, which crushed the Cowboys 34-7 earlier this season.