The Bears on Monday signed guard Lucas Nix to a one-year contract and waived/injured tackle/guard Jason Weaver.
Nix appeared in 15 games with 10 starts over two seasons with the Raiders in 2012-13 after being signed by Oakland in 2012 as an undrafted free agent from Pittsburgh. In 2013, the 6-5, 325-pounder played in 14 games with nine starts at left guard and one start at right guard.
Nix spent the 2014 preseason with the Raiders before being released prior to the start of the regular season.
Weaver spent the final two months of last season on the Bears' practice squad.