He joins T.J. Yates and Sean Renfree in the competition for the No. 2 QB role. Grossman played under Falcons offensive coordinator Kyle Shanahan and went 6-10 in two seasons. He spent 2010-2013 with the Redskins.
Atlanta waived injured running back Evan Royster to make room for the 35-year-old Grossman on the roster.