Mackenzy Bernadeau, new backup center

PHILADELPHIA -- For the first time this season, the Cowboys did not go with a backup center on the sidelines with David Arkin inactive Sunday at Philadelphia and Phil Costa out with an ankle injury.

It left Mackenzy Bernadeau as the backup against the Eagles to Ryan Cook.

“I rotate every day in practice, so it’s not something I’m not prepared for,” Bernadeau said. “With the team, scout team, everything. Since I’ve been here, I’ve been learning center and guard, so I wasn’t worried.”

Bernadeau has yet to play a regular-season snap at center in his career, but he played there some in the preseason for Carolina. Injuries prevented Bernadeau from taking snaps at center in the preseason.

How long the Cowboys go this route will be interesting.

Kevin Kowalski has two more weeks of practice before he has to be activated to the 53-man roster after missing the first six weeks on the physically unable to perform list. Costa is at least a few more weeks away from returning after dislocating his ankle Oct. 21 at Carolina.

One thing is clear: the Cowboys do not want to play Arkin, a fourth-round pick last year.