Robert Griffin III will be inactive Sunday; Rex Grossman to back up Kirk Cousins

Robert Griffin III will be inactive for Sunday's game against the Falcons. (Patrick McDermott/Getty Images)

Not only will Robert Griffin III not start on Sunday, he won't even be the Redskins' backup.

Eleven-year veteran Rex Grossman, who last threw a pass in a regular season game in 2011, will back up Kirk Cousins, who will be Washington's starter on Sunday. RGIII will be inactive, according to Jeff Darlington of NFL Network.

The 33-year-old Grossman, who took the Bears to Super Bowl XLI, has 56 career touchdown passes and 60 interceptions.

SI WIRE: Report: Mike Shanahan benching RGIII was intended to provoke his firing

Redskins players have been told Rex Grossman will backup Kirk Cousins on Sunday -- and Robert Griffin III will be inactive.
— Jeff Darlington (@JeffDarlington) December 11, 2013

I asked player who told me that info if he believed health is truly the reason for RG3 benching: "I believe that's the best way to sell it."
— Jeff Darlington (@JeffDarlington) December 11, 2013