The 33-year-old hired agent Leigh Steinberg, who announced the former University of Texas star's intentions on his Twitter account Wednesday:
On Thursday, Steinberg said Young has "opened discussions" with the Saskatchewan Roughriders of the CFL.
Young last stepped on an NFL field in 2011, when he served as a backup QB for the Philadelphia Eagles. He appeared in six games, made three starts and finished with four touchdowns and nine interceptions.
He spent the majority of his professional career with the Titans, who drafted him with the third overall pick in 2006. In five years with Tennessee, he posted a 75.7 quarterback rating, helped his team to a 30-17 record as a starter and was named to two Pro Bowls.
Young first made a name for himself at the University of Texas, where he finished second in the Heisman Trophy voting in 2005 and led the Longhorns to the 2006 national title.
While Young bounced around after his failed stretch with the Eagles, including opportunities with the Green Bay Packers, Buffalo Bills and Cleveland Browns, he couldn't stick in any spot.
The signal-caller officially announced his retirement in 2014, although in an interview with KXAN Radio, he qualified it with "unless we get a great opportunity, something guaranteed," via ESPN.com's Max Olson.
Mike Florio of Pro Football Talk reported in January that Young has some interest from the Spring League, which is a developmental league.