Downie spent Friday and Saturday in a hospital being evaluated. He was released Sunday.
"I wasn't too scared," he told reporters in Philadelphia. "It was precautionary reasons. They got a couple X-rays done. It's healing well. Should be back soon."
Downie's left eye is badly bruised and he skated wearing a full face shield and football-type facemask to protect his face.
While Downie said his vision is fine, he said he's having problems with his sinuses.
"That's the issues that I'm having, the sinuses," he said. "So I'm just waiting for that to clear up and start breathing again. Mainly sinuses right now."
Downie will not play Thursday but did not rule out a return for the Flyers' game Saturday against the visiting Edmonton Oilers. The team lists him as day-to-day.
"It's good to see [Downie] skating already," Flyers coach Craig Berube said. "Hoping he'll be back soon."