The Redskins have signed offensive lineman Fred Matua and defensive tackle Zarnell Fitch, the team announced on Sunday.

Fitch and Matua will take the roster spots of defensive lineman J.T. Mapu and offensive lineman Kerry Brown, who were waived on Sunday with an injury settlement.

Fitch, 6-3 and 320 pounds, spent two games on Baltimore's active roster in 2007. He was inactive for one contest and did not play in the other. He also spent 13 weeks on the Ravens' practice squad.

Fitch originally signed with the New York Jets' practice squad on December 27, 2006 and was allocated by the club to NFL Europa that spring.

Playing for Frankfurt, Fitch participated in all 10 games with five starts, finishing with 23 tackles and aiding the Galaxy to their fifth World Bowl appearance.

The Spencer, Okla., native played two seasons at Texas Christian (2004-05) after transferring from Navarro (Texas) Junior College. The 25-year-old Fitch was born on July 6, 1983.

The 6-foot-2, 310-pound Matua was originally drafted in the seventh round of the 2006 draft (217th overall) by the Detroit Lions.

After being released prior to the start of the regular season, he signed with the Tennessee Titans' practice squad and later joined the Cleveland Browns' active roster. Matua spent the final 10 weeks on the Browns' 53-man roster and was inactive for nine contests and did not play in the other.

The Lakewood, Calif., native was an All-American at USC where he played from 2002-05.

Brown signed with the Redskins as a college free agent out of Appalachian State on April 30, 2008. Mapu re-signed with the Redskins on July 22.

Last Friday, Brown suffered a shoulder injury and Mapu had a knee ligament injury.