ALAMEDA, Calif. – The Oakland Raiders have signed unrestricted free agent OL Kelechi Osemele (kah-LETCH-ee oh-SEM-uh-lee), the club announced Thursday.

Osemele joins the Raiders after four seasons with the Baltimore Ravens, where he played in and started 51 games. Originally selected by Baltimore in the second round (60th overall) of the 2012 NFL Draft, Osemele made starts at right tackle, left guard and left tackle over his first four seasons in the league.

Last season, the 6-foot-5, 330-pounder started 14 games (10 at left guard and four at left tackle) for an offensive unit that allowed the third fewest sacks in the NFL (24) and produced a single-single season franchise record for net passing yards (4,271). He started 21 games at left guard from 2013-14, helping Baltimore set franchise records for yards (5,838) and points scored (409) in 2014.

As a rookie in 2012, Osemele started all 16 regular season games at right tackle before moving to left guard for Baltimore's four postseason games. In helping the team win Super Bowl XLVII, Osemele helped pave the way for the offense to amass 410.3 yards per game in the postseason.