Doucet was released by Arizona in March.
Doucet, a third-round draft pick in 2008, has been plagued by injuries much of his NFL career. He caught 28 passes for 207 yards in 12 games last season. For his Arizona career, Doucet had 139 catches for 1,491 yards and seven touchdowns in 54 games.
Information from ESPN NFL Insider Adam Schefter and The Associated Press was used in this report.