According to Rapoport, Doucet will receive a one-year contract.
Doucet, 27, caught 28 passes for 207 yards in 12 games (three starts) for Arizona in 2012. The previous season, Doucet set career highs in catches (54), yards (689) and touchdowns (five) for the Cardinals.
Doucet (6-0, 212) was a third-round pick of Arizona in 2008 out of LSU and spent five seasons with the Cards, catching 139 passes for 1,491 yards and seven touchdowns. Arizona released him in March.
In Seattle, Doucet will vie for a complementary role behind starters Golden Tate and Sidney Rice. Moreover, Doug Baldwin is likely to be the third receiver, leaving Doucet to compete for a spot further down the depth chart. The Seahawks will be without Percy Harvin (hip) to begin the regular season, which helps Doucet’s chances of sticking on the roster.