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.
The 30-year-old is now expected to aid a receiving corps that includes 2017 first-round pick Corey Davis, Rishard Matthews, Tajae Sharpe, and Harry Douglas.
Decker's two years removed from an 80-reception, 1,027-yard season in which he scored 12 touchdowns.
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