Orlovsky, 30, is a former Lions fifth-round draft pick from the 2005 NFL draft out of Connecticut.
In college, Orlovsky set school records with 10,421 yards and 84 touchdowns.
Orlovsky signed a three-year, $9 million contract with the Texans in 2009.
In 2011 for the Colts, Orlovsky completed 30 of 37 passes for 353 yards, two touchdowns and one interception for a 113.1 passer rating in a loss to the New England Patriots.
Orlovsky led the Colts to a comeback win over the Texans during the 2011 season.
Orlovsky has completed 58.5 percent of his career passes for 2,931 yards, 14 touchdowns and 12 interceptions for a 76.0 passer rating in nine NFL seasons.
Follow me on Twitter: @RavensInsider
Aaron Wilson covers the Ravens for The Baltimore Sun