With guard Nate Livings missing practice Thursday because of knee soreness, the Cowboys are down to just four healthy players at guard and center going into Sunday's preseason opener against the Dolphins.
It's such a concern to the Cowboys that they are working out two offensive lineman today in hopes of signing them to contracts.
"We are worried of course," vice president Stephen Jones said. "Having this many guys injured, that's why we are bringing guys in every time you turn around.
"We are not concerned for the long haul. But it's concerning because we got to play preseason games."
Jones said the Cowboys are concentrating on young players right now but would not rule out bringing in a veteran guard prospect at some point.
"We got our eyes on every thing that will help our football team," Jones said. "But no one in particular."
The list of healthy interior players the Cowboys had a practice on Thursday morning were centers Travis Frederick and Phil Costa and guards Ronald Leary and David Arkin.
Sidelined along with Livings are: guard Kevin Kowalski (knee), center Ryan Cook (back), guard Ray Dominguez (shoulder) and guard Mackenzy Bernadeau, who has been on the physically unable to perform list since the start of camp with a hamstring injury.