Cowboys dealing with banged-up offensive line

OXNARD, Calif. -- Following the Cowboys' walk-through practice Thursday, Cowboys executive vice president Stephen Jones expressed concern about the offensive line.

The Cowboys were missing starting left guard Nate Livings with knee soreness during the walk-through, adding to an already crowded field of injured offensive linemen. Jones said the Cowboys will work out two young linemen Thursday.

"Of course, to have this many guys injured, that's why we're bringing guys in," Jones said. "We're not concerned for the long haul because we have (five) preseason games."

Right guard Kevin Kowalski is out two to four weeks with a bruised knee, right guard Mackenzy Bernadeau (hamstring) is out until perhaps next week, and guard Ray Dominguez (shoulder) and center/guard Ryan Cook (back) are out for an undetermined length of time. And now Livings' status is uncertain.

Heading into Sunday's preseason opener against the Miami Dolphins, the Cowboys have two healthy guards, David Arkin and Ronald Leary, and two centers who can play guard, rookie Travis Frederick and Phil Costa.

"We're going to play the guys that are available to play and probably play some of the younger guys," coach Jason Garrett said. "We haven't had those specific conversations about the exact playing time that each of these guys are going to have in this game."