IRVING, Texas -- Mackenzy Bernadeau has been here before.

The Dallas Cowboys guard has started 47 games in his NFL career and might get another one Sunday against the Arizona Cardinals. Starting left guard Ronald Leary is nursing a pulled groin and his status is uncertain, so that means, coach Jason Garrett may turn to a veteran who played in overtime in last week's loss to Washington when Leary was injured.

"It's always exciting to get a chance to play and I don't consider this as me taking Ron's spot," Leary said. "I consider it me being accountable when one man goes down somebody has got to step up and play. So its just a great opportunity to get out there and play and hopefully Ron gets healthy and if not, I'll be ready to go."

Bernadeau has become a reliable lineman for the Cowboys because he's played both guard positions and started two games at center in 2012. When Bernadeau played in Carolina he started at both guard positions so just moving around the offensive line isn't a big deal.

"I'm comfortable at all three," Bernadeau said. "I played left most of the time, I've been prepping for it all season long in case something like this happens."

His potential return comes against an Arizona defense with just seven sacks on the season but is determined to send pressure on the quarterback by sending six and sometimes seven defenders. Arizona, despite being tied for 29th in the league in sacks, is tied for third with 10 interceptions because they play a tight man-to-man defense.

The pressure on the quarterback forces him to hurry throws and make quick decisions. The offensive line's communication has to be good, especially if Brandon Weeden is forced to start because of Tony Romo's back injury.

"They're good, they have a great front four, in the sub front they're great, they got a great 3-4 defense they got some guys who move around pretty well and some guys who can blitz and played a lot of games," Bernadeau said. "It's a great opportunity to just get out and play, we're preparing real well for it and just [by] looking at their games we'll be ready."