OAKLAND, Calif. - The Oakland Raiders have signed Western Illinois football senior Andrew Robiskie to a free agent contract, the organization's general manager Reggie McKenzie announced.

Robiskie, a center with the Leathernecks, started the final 25 games of his career in Purple & Gold and helped the team to a playoff run in 2010.

Currently, Robiskie is one of just two centers listed on the roster out of the 14 offensive linemen.

He was signed after participating on a tryout basis at the team's rookie mini-camp this past weekend.

Robiskie will continue his competition for a spot on the Raiders' active roster when organized team activities begin on May 20.