Justin Dunk of 3DownNation, which covers the CFL, reported Tuesday that Richardson was heading to Regina, Saskatchewan, to finalize a contract with the Roughriders.
That's no longer the case.
The reason, Richardson said, is because he would have had to sign a one-year contract with a team option for a second year, so he would have essentially been locked into playing two years in Canada if he did well.
That means the 27-year old Richardson, whose goal is to get back to the National Football League, wouldn't have been able to sign with an National Football League team until 2019.
Three Down Nation was the first to report the possible signing. He last appeared for the Oakland Raiders in the 2015 preseason, running for 42 yards on 15 carries.
The former Alabama standout rushed for 950 yards in rookie season with the Cleveland Browns, adding 367 receiving yards with 12 touchdowns.
The Riders now 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 Christion Jones, a Crimson Tide product, plus Canadians Greg Morris and Kienan LaFrance.
Richardson hasn't played in a regular-season game since 2014. The Colts waived him the following March.