Cowboys executive vice president Stephen Jones said there wasn't anything serious.
“You know you get that first initial pain when you do something, it scares you a little bit,” said Claiborne, who expects to practice Wednesday.
Also, rookie wide receiver Terrance Williams expressed frustration with missing practice due to a concussion. Williams suffered the concussion in last Friday's practice and missed the first preseason game against the Miami Dolphins.
Williams has to be symptom-free for seven days before he's cleared to practice. He hasn't had any headaches or other concussion-related issues, but it appears he still won't play in Friday's second preseason game at Oakland because the game is fewer than seven days away from when he suffered the concussion.
"Got mental reps," Williams said after practice. "It's just frustrating, that's all. I'm going day by day. It's hard just to watch everyone. I can't just watch football and not being out there. I have to be patient."
Also, cornerback Brandon Carr missed practice because his fiancée delivered a baby. LB Alex Albright (back), guard Ray Dominguez (shoulder), S Matt Johnson (foot and ankle), G Kevin Kowalski (knee), G Nate Livings (knee), T Jeff Olson, T Jermey Parnell (hamstring), DE Anthony Spencer (knee), DT Jay Ratliff (hamstring) were missing as well.