Miles Austin, Justin Durant and George Selvie again missed practice Thursday, adding to the doubt that they will be ready for Sunday's game against the Broncos.
Austin has been rehabbing a hamstring injury that caused him to miss the game at San Diego. Durant suffered a groin injury, and Selvie a concussion in the game.
The Cowboys also have medical questions for special teams. Receiver and punt returner Dwayne Harris, who has a hip pointer from the St. Louis game, was limited in practice after going full the day before. Defensive end Edgar Jones sat out practice because of a groin injury; he had been limited in practice on Wednesday.
Harris and Jones are the top two tacklers on special teams, which will be challenged by Denver's Trindon Holliday, who has a punt return and a kickoff return for a touchdown this year, and six combined in his 21-game career.
For the second day, however, DeMarcus Ware (back), Bruce Carter (foot) and Morris Claiborne (shoulder) practiced in full.