Former TCU offensive lineman Jeff Olson didn't wear the Cowboys' gear for long. Signed last week after a string of injuries at the guard position, Olson was concussed in his first practice. He has been rehabbing since.
Olson was at practice Thursday, including doing rehab work, but Cowboys coach Jason Garrett talked to him afterward. The Cowboys released Olson just after practice Friday.
The Cowboys still are thin at the position. Guards Ryan Cook (back), Kevin Kowalski (knee), Ray Dominguez (shoulder) and Nate Livings (knee) missed practice Thursday. Dallas tried and failed to sign veteran guard Brandon Moore, who retired Wednesday after agreeing to terms Tuesday night.
-- Charean Williams