"It's a day-to-day thing," Brunell said. "I had an MRI today. It feels better than it did on Saturday and I think each day I'll improve a little bit more."
Brunell was injured when he was sacked in the third quarter of Saturday's 35-20 victory over the New York Giants. Patrick Ramsey finished the game and will start against the Eagles if Brunell can't play.
A victory at Philadelphia would give the Redskins their first playoff berth in six years.
"We've worked real hard and we've put ourselves in a position where we can get in the playoffs," Brunell said, "and obviously this game is critical."