Or, as coach Mike Shanahan put it: "There is a very, very good chance he is going to play."
|More on Washington Redskins|
|NFL coverage on the go|
Griffin went through a full practice Friday for the third straight day after missing last week's win over the Cleveland Browns with a sprained right knee.
Fellow rookie Kirk Cousins filled in, making his first career start in a 38-21 victory.
"Like I said, probable [means] there is a very, very good chance he is going to play," Shanahan said. "There doesn't look like there are any setbacks with him. But if something crazy happens, obviously, we will know before the game. But talking to him after practice, he's fine.
"[I will] probably find out later on [Friday]. But if I put him as probable, it's 98 percent. So it's pretty good," Shanahan said. "I know I'm not a doctor, but he took all the reps today."
Less certain for Sunday's game are defensive end Stephen Bowen and right tackle Tyler Polumbus. Bowen has a torn upper biceps, and Polumbus is recovering from a concussion. Both are listed as questionable.