Coach Wade Phillips said running back Marion Barber has a fractured left thumb and outside linebacker DeMarcus Ware has a stress fracture in his left foot.
Barber thought he just jammed against Kansas City before the bye week. An X-ray revealed the break.
Phillips said the right-handed Barber didn't appear to have trouble carrying the ball or catching it in practice Wednesday.
Phillips said Ware had been complaining about soreness in his foot for a couple of weeks, and an MRI revealed the stress fracture.
Wide receiver Roy Williams is still recovering from three bruised ribs, and Phillips said he's not sure about his status.
All three players practiced in the rain on Wednesday with no major issues, but Phillips said he wanted to see how Williams felt after practice before committing him to the starting lineup.
Williams was sore after Monday's practice, and that raised a concern.
If Williams, who missed the game at Kansas City, is out, expect Patrick Crayton and Miles Austin to start against the Atlanta Falcons.
The biggest concern among the injuries is that Barber is banged up again.
Since being named the starter last season, Barber has battled toe, thigh and now a thumb injury. In 2007, the year he was a backup to Julius Jones, Barber rushed for 975 yards and 10 touchdowns on 204 carries. He missed no games because of injury.
In 2008, his first season as a starter, Barber battled a toe injury that forced him to miss one game and limited his ability to make plays toward the end of the year. He rushed for just 15 yards in the last three weeks of the 2008 season.
Phillips said he wasn't concerned about Barber's durability.
"I'm looking at the future, and he had legitimate injuries and he can get injured in this league," Phillips said. "And it wasn't the same thing, and it's possible to get banged up and he hasn't missed anything with the [thumb], whether its an injury or not. He didn't miss a game, and he's not going to miss a game. If you miss him for games and its the same thing every time, then you worry about those things."
As for Ware, Phillips said he should be fine and that the injury has nothing to do with him having just two sacks through five games this season.
"It's been bothering him for a couple of weeks and his foot was sore," Phillips said. "But he played the last game and he did all right, I thought, and he's been playing well. It's not a major injury, its one you can play with."
All 10 players on the latest injury list, the first the Cowboys have had to release since before the Kansas City game, fully participated in practice Wednesday.
That included receiver Wililams, running back Felix Jones (strained left knee) and safety Gerald Sensabaugh (right thumb). All three missed the Kansas City game.
Jones, who has missed two games, wore a brace in practice and might wear one in a game for the first time. Phillips said the protection didn't appear to slow down Jones, who had 190 yards rushing in the last two games he played.
The others hurt but practicing were offensive linemen Marc Colombo (ankle), Leonard Davis (thumb) and Andre Gurode (knee); safety Michael Hamlin (wrist); and linebacker Curtis Johnson (hamstring).
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