Griffin sustained a torn ACL and MCL in January in the Redskins' playoff defeat to the Seattle Seahawks and missed most of his side's off-season training, and as a result has had a below-par season.
"It's absolutely about performance now," Canty told CSNWashington.com. "You wanna evaluate all your talent. I absolutely believe that a part of that is evaluating quarterback Kirk Cousins because clearly RGIII is not healthy.
"He does represent the future of your franchise, and you don't want to continue to put him in harm's way, as we saw in the second half with the Giants pass rush."
The Redskins are 3-9 in their season going into week 14.