This comes just days after the team released running back Warrick Dunn, and weeks after it released Pro Bowl tight end Alge Crumpler, who signed with the Tennessee Titans. Offensive tackle Wayne Gandy and quarterback Byron Leftwich were also released.
Now, experts are predicting that because of the release of Harrington, who started 10 games last season, Atlanta will select a quarterback with the No. 3 overall pick in next month's NFL draft.
Harrington had 2,215 yards passing with seven touchdown passes and eight interceptions last season.
The Falcons actually re-signed quarterback Chris Redman to a two-year deal. Excluding Michael Vick, who was sentenced in December to 23 months in federal prison, the only other quarterback on the roster is D.J. Shockley, who missed last season with a knee injury.