The Raiders' starting quarterback is made available to the media on the same day each week, but the podium went unoccupied on Wednesday, another sign of the uncertainty surrounding that position.
Third-string quarterback Kyle Boller was taking reps with the first-team offense during the brief window of media access at practice. So was punter Shane Lechler.
Regular starter Bruce Gradkowski is limited because of a right shoulder injury, and backup Jason Campbell also is limited because of a left knee strain he suffered against the 49ers on Sunday.
"It may have to be a game-time decision," Raiders coach Tom Cable said about his starting quarterback for Sunday's game against the Denver Broncos.
Cable did say Campbell will start ahead of Boller if he is healthy enough.
Boller hasn't played in any of Oakland's six games this season, but he has started 46 games during his seven-year NFL career. Also, Cable isn't hiding his displeasure over Campbell's poor showing against the 49ers, when he completed 8 of 21 passes for 83 yards and threw two interceptions in the 17-9 defeat.
Cable said he doesn't even have a fair idea of who will start against the Broncos.
"It would just be speculation right now," Cable said.
"There were a couple times when he did cut it loose, and it was good," Cable said. "He felt good afterward. If we get out here (today) and there's no setback or anything like that, hopefully we're through it."
McFadden has missed the past two games.