"Vikings interim coach Leslie Frazier said Friday he will list quarterback Brett Favre as doubtful for Sunday's regular-season finale at Detroit. That means the quarterback's 20-year career likely will end with him on the sideline.

Frazier, for the first time, would not say if Favre had taken the baseline neurological exam again. "I'm just going to leave it as doubtful for now [that he will play] without going into any detail about it," Frazier said.

Asked the Vikings still intended to take the decision up to Saturday to see if Favre could past the first stage of the test," Frazier said: "That would be assuming that he hasn't done it already and hasn't passed it. But if we leave doubtful, it should cover things with him. You never rule him out."

Frazier was referring to the fact that he ruled Favre out of the Vikings' loss to Chicago on Dec. 20 because of an injury to his throwing shoulder. Favre woke up that morning and informed the team he could play. This is a different situation because Favre is suffering from a concussion and must pass a battery of tests before he is allowed to participate."