ALAMEDA, Calif. — The Oakland Raiders signed former Nebraska quarterback Sam Keller to a contract Wednesday and waived quarterback Erik Meyer.

Keller was not drafted despite setting a school record last season by completing 63.1 percent of his passes for 2,422 yards and 14 touchdowns in nine games. But his season ended when he suffered a shoulder injury against Texas in October.

Keller, who went to high school in the San Francisco Bay area, spent his first three college seasons at Arizona State.

Keller will compete for one of the spots on the roster behind starter JaMarcus Russell. Andrew Walter, who started at Arizona State while Keller was a freshman there, is the only other quarterback returning from last season, but the Raiders also signed Marques Tuiasosopo as a free agent this offseason.