The Cowboys have made a trade to improve their offensive line, less than a week before the start of the 2012 NFL Season.

Dallas has acquired Ryan Cook from Miami, according to espn.com, in exchange for a seventh-round pick. Cook played against the Cowboys on Wednesday in the team's final preseason game.

Cook was drafted in the second round by the Vikings in 2006. The offensive lineman started 40 games for Minnesota before joining the Dolphins last year. He has experience at right tackle, right guard and center.

The Cowboys had trouble putting together a consistent offensive line in front of Tony Romo this preseason.

Starting center Phil Costa has been suffering from a strained lower back for three weeks. He final played in Dallas's last preseason game after missing the first three exhibition contests. David Arkin had trouble in his time filling in for Costa.

Backup lineman Bill Nagy and Kevin Kowalski has also battled injuries. Cook should improve the Cowboys depth at the position.

Dallas allowed 39 sacks in 2011, putting them in the middle of the pack of the league. Cook comes over from Miami, a team that had difficulty protecting their quarterback. The Dolphins gave up the third-most sacks with 52.

Cowboy quarterbacks were sacked nine times this preseason. They went 3-1 in their four exhibition games.

The Cowboys will visit the Giants to open up the season on Sept.5.