The Washington Redskins have made their first free agent addition to their offensive line, signing guard Chris Chester away from the Baltimore Ravens, according to his agent Craig Domann.

Chester's contract is worth $20 million over five years. The move meets a pressing need for Washington, who Thursday morning released center Casey Rabach, and the plan is for Kory Lichtensteiger and Will Montgomery, who ended the year as the starting guards, to compete for the starting center job.

The 6-foot-3, 315-pound Chester, who started 14 games for Baltimore last season, is entering his seventh season in the NFL and according to scouting reports is capable of playing any of the interior line spots. Chester will be reunited with Redskins offensive line coach Chris Foerster, who coached him in Baltimore in 2006 and 2007.

The Redskins still have veteran Artis Hicks under contract, and he started the season at right guard before going down with a groin injury. Montgomery took over and never relinquished the job.

Washington also has guard/center Erik Cook and rookie guard Maurice Hurt on the roster. It wouldn't be surprising to see them add another guard. Signing a right tackle also remains a high priority as Jammal Brown is free agent.