None of the Cowboys' top three centers are scheduled to play in Monday's preseason opener against the Oakland Raiders. Backups Bill Nagy and Kevin Kowalski both are out indefinitely with ankle injuries. Phil Costa has been sidelined by a back injury, but an MRI indicated the third-year pro's ailment isn't serious.
"We will continue to evaluate that situation as we go forward and just try to give ourselves the best chance inside," Garrett told The Associated Press. "We've had a rash of injuries at that spot, so we are just trying to manage it the best we can."
The Associated Press contributed to this report.