Allen Park – The Detroit Lions made a four-player swap along the defensive line on Thursday, waiving two undrafted free agents to add a pair of young veterans.

The team announced they’ve signed defensive tackles Ego Ferguson and Bruce Gaston, while letting go Nick James and Maurice Swain.

Ferguson, a former second-round pick by the Chicago Bears, hasn’t played in a regular-season game since October 2015. He suffered a knee injury that year, followed by a season-ending shoulder injury last preseason.

The 6-foot-2, 300-pounder was released by the Bears in March. He was claimed off waivers by the Packers, but waived days later after failing a physical.

As a rookie in 2014, he recorded 24 tackles and two sacks in a reserve role. Lions fans may remember him as the player Dominic Raiola stepped on that season, drawing a one-game suspension for the former Lions center.

Gaston was an undrafted free agent in 2014 and has bounced around the league trying to find a home. Detroit marks his 10th team in three years. He appeared in nine regular-season games for the Bears and Packers in 2015, registering 12 tackles and a sack.