Brandon Carr working out at left cornerback

From the moment he signed a five-year, $50.1 million contract with the Dallas Cowboys, cornerback Brandon Carr's placement in the secondary was uncertain.

At the NFL owners meetings last week, Jerry Jones and Jason Garrett said Carr can play both left and right cornerback but no final determination was made regarding his spot on the defense.

Well, Carr told ESPN Dallas he's working out at left cornerback in anticipation of being there when the season opens Sept. 5 at the New York Giants.

Carr played the last two seasons at right cornerback for the Kansas City Chiefs, but also lined up on the left side and the slot. The Cowboys' right corner is Mike Jenkins and Orlando Scandrick is the slot corner.

"If you want to be an elite corner you have to play both sides of the field," Carr said last week after a tour of the ESPN studios in Bristol, Conn. "And you have to challenge yourself and play outside your comfort zone and play the left or the right, play in the slot or play wherever is needed. That's why this offseason I got [to] adjust to both sides of the field, so come September 5 I can play on both sides and be comfortable. I've been pushing myself out of my comfort zone and playing on my left side."

Of course, Carr has met defensive coordinator Rob Ryan and was impressed with the man, who enters his second season with the Cowboys.

"I can tell he’s comfortable with who he is," Carr said. "He doesn’t sugar coat anything, he keeps it real. That’s what you ask for in a coach, defensive coordinator, just from what I know his scheme is everything a defender would want to play in."