Dunbar, 30, originally signed on with the Saints as an undrafted free agent back in 2008. He spent over four years in New Orleans before joining the Rams as an unrestricted free agent back in 2012.
Dunbar was released by the Rams at the start of the season as they trimmed their roster down to 53 players. He later caught on with the Saints before he was once again placed waived.
This season, Dunbar has appeared in three games and recorded 11 tackles for the Saints.
Richardson, 25, is a former seventh-round pick of the Rams back in 2012. He spent two years in St. Louis before he was waived and later claimed by the Jets, but was unfortunately among the team’s early roster cuts.
The Texans signed Richardson in September and was on and off of their practice squad for most of the year before being waived a few weeks ago
Richardson hasn’t appeared in an NFL game since the 2013 season when he ran for 215 yards on 69 carries (3.1 YPC) to go along with 14 receptions for 121 yards receiving and no touchdowns.