The team made the announcement Thursday.
Thomas retired last summer after trying to earn a spot on the Chicago Bears' roster.
The Washington Redskins selected him out of Michigan State in the second round of the 2008 draft and cut him two years later. He was with Washington, Carolina and the New York Giants in 2010. He played for the Giants in 2011, his last year in the league.
Thomas has 43 career receptions for 482 yards and three touchdowns. He has returned 60 kickoffs.