Philadelphia Eagles coach Andy Reid said Monday that running back LeSean McCoy's concussion is not as bad as quarterback Michael Vick's, but it is not clear when either of them will return, NFL.com reported.
Reid said both players are still in Stage 1 of concussion testing, which means that their baseline tests are not normal.
McCoy experienced headaches Monday and Vick reportedly still has serious symptoms.
Rookie quarterback Nick Foles made his debut start on Sunday against the Washington Redskins, but was ineffective. Reid said Vick would return to the starting role when he is cleared to play.
Philadelphia fell to 3-7 after its 31-6 loss to Washington.
"I know we're letting the fans down and the city down," Reid said on the team's website. "I completely understand that. There are no excuses."