Douglas, 30, was a third-round pick by the Falcons in 2008 and played the first six seasons of his career in Atlanta.
In 12 games last season, Douglas caught 51 balls for 556 yards and two touchdowns. His best season came in 2013 when he had 85 catches for 1,067 yards and two touchdowns.
Tennessee finished No. 22 in passing yards and No. 30 in total yards last season. The Titans added Dick LeBeau to their coaching staff and released safety Bernard Pollard this offseason. They own the No. 2 pick in the upcoming draft.
- Paul Palladino