The 26-year-old Allen was a fifth-round selection in the 2014 NFL draft out of Purdue. He signed a $2.9 million restricted free agent tender in June.
Allen had a bumpy start to his career. He was cut and spent a season on the practice squad. He settled in nicely as the team’s starting free safety after a position switch under coach Dan Quinn.
In four seasons with the Falcons, Allen has played in 46 games and made 45 starts. He has six interceptions, 10 deflected passes, one fumble recovery and 158 tackles. Last season, Allen, who knows the intricacies of the defense, slid inside to play nickel back as the secondary was hit with injuries.