The Saskatchewan Roughriders have added former NFL running back Trent Richardson to their neg list.

The 27-year-old is currently a free agent and has been out of the game since being released by the Baltimore Ravens in August of last year. He was briefly on the Ottawa Redblacks neg list last September but was dropped a couple of weeks later. The Riders added him to the list of 45 players to which they have exclusive negotiation rights on July 28.

The Alabama product rushed for 1,679 yards and 21 touchdowns for the Crimson Tide in 2011. After finishing third in the Heisman Trophy voting that season, behind Robert Griffin III and Andrew Luck, Richardson ran for 96 yards and one touchdown to help Alabama win the BCS National Championship.

Following the title game victory, Richardson declared for the 2012 NFL Draft. That May, Cleveland traded up to select the five-foot-nine, 230-pound back No. 3 overall. He signed a fully guaranteed four-year $20.4-million deal that included a $13.3-million signing bonus.

As a rookie NFL running back, Richardson carried the ball 267 times for 950 yards (3.6 yards per carry average) and 11 touchdowns while adding 367 yards and one touchdown on 51 receptions.

Two games into the 2013 NFL season, Indianapolis traded a 2014 first-round pick for Richardson. The 27-year-old spent the rest of the 2013 season and entire 2014 campaign with the Colts. Richardson ran for 977 yards and six touchdowns and recorded 494 yards and one touchdown on 55 catches in 29 games with Indianapolis.

The Riders currently have two American running backs on the roster, led by Cameron Marshall who has 74 carries for 390 yards in seven games this season and they also have Canadian Kienan LaFrance.

The team has also experimented with former NFLers looking for a second chance, having brought former star quarterback Vince Young to training camp this season.