TEMPE, Ariz. – Drew Stanton said Thursday he’s symptom-free, four days after being knocked out of Arizona’s loss to Denver with a concussion.

That’s the first step in him returning to the field in time for Sunday’s game against Washington.

“I feel good,” Stanton said. “I haven’t had any setbacks. Every day, kinda progressing and being able to get over hurdles. Again it was a matter of feeling good through workouts and kinda expanding it a little bit and feeling comfortable with what’s going on.”

On Friday, Stanton will go through the rest of the NFL’s concussion protocol with the plan to pass it and getting cleared to play. He’ll meet with Cardinals team doctor Wayne Kuhl, take the IMPACT test and then see an independent neurologist. If he gets the green light from all three, there’s a chance Stanton might be Arizona’s starting quarterback against the Redskins.

He started going through the game plan on Thursday while continuing to throw. Stanton was cleared to toss Wednesday and on Thursday he went through a limited practice for the second straight day despite not being on the field for the open part of Thursday’s practice.

“Just loosened up, kinda moved around, threw, went through the game-plan stuff and just got a feel for everything,” Stanton said. “It was my first day of really kinda diving into it. Yesterday, just did routes on air.

“Tried to get a better feel for everything.”

Carson Palmer wasn’t available to talk to the media Thursday and offensive coordinator Harold Goodwin didn’t discuss injuries, but Stanton, who was 2-0 before Sunday’s loss, wouldn’t quantify the odds of him returning.

He said he’s more comfortable around light – he left the locker room in Denver wearing sunglasses – and isn’t dizzy, and can focus and concentrate better.

“Hopefully, tomorrow will be another step forward in that process,” Stanton said.

“The nice thing about playing quarterback,” Stanton added, “is I don’t have to worry about contact throughout the course of the week leading up to Sunday.”