Dallas Cowboys offensive guard Nate Livings needs to have another surgery on his right knee, according to ESPN Dallas.
Livings underwent knee surgery in February.
He got hurt again in May, but was unable to practice Thursday.
The Cowboys are also without guard Mackenzy Bernadeau due to a hamstring injury.
So, the Cowboys have signed Jeff Olson and James Nelson as reinforcements for the line.
The Cowboys are also looking at former Kansas City Chiefs and New England Patriots offensive guard Brian Waters.
Follow me on Twitter: @RavensInsider
Aaron Wlson covers the Ravens for The Baltimore Sun.
Check out our partners at TiqIQ for the best deals on all games on the 2014 NFL schedule.
AUG 22 Ari Nissim
Ten players closing in on lucrative new paydays.
AUG 22 Joel Corry
Considered by many as a ‘red flag prospect’ during draft season, the Cincinnati linebacker continues to prove people wrong.
AUG 19 Jesse Lawrence
Seahawks, 49ers tickets lead most expensive Rivalry Game premiums on secondary market