Oakland Raiders quarterback Terrelle Pryor suffered a concussion late in Monday night's 37-21 loss to the Denver Broncos.
The injury occurred late in the fourth following a helmet-to-helmet hit by Broncos linebacker Wesley Woodyard.
"I have no idea," Raiders head coach Dennis Allen said of Pryor's availability for Oakland's upcoming game Sunday against the Washington Redskins. "He's got to go through the protocol, just like everybody else."
Pryor completed 19-of-28 passes for 281 yards and a touchdown before his departure.