ESPN's Adam Schefter was the first to report the story.
Decker was released by the New York Jets on June 12 after three seasons with the club. The veteran wide receiver was placed on injured reserve in October with a shoulder injury and was limited to three games.
After being released, Decker made his lone visit with the Titans on Wednesday.
Decker's two years removed from an 80-reception, 1,027-yard season in which he scored 12 touchdowns.