EDEN PRAIRIE, Minn. -- Minnesota Vikings quarterback Brett Favre and wide receiver Sidney Rice have not passed their concussion tests and are listed as doubtful for Sunday's game against the Detroit Lions.
For Favre, the game is what he has said will be the last of his 20-year career.
Both Favre and Rice have until Saturday to be cleared or they will not play.
Favre wore his red quarterback jersey, but he didn't have a helmet on and didn't participate in any drills during Friday's practice. Interim coach Leslie Frazier declined to address whether Favre has passed the post-concussion testing required by the league to return to action.
Favre suffered the head injury against Chicago on Dec. 20 and missed the last game at Philadelphia because of it, the second time in three weeks he sat out after his all-time record consecutive starts streak ended.
"I'm going to just leave it as doubtful for now, without going into any detail about it," Frazier said, adding: "If we leave him doubtful, it should cover things with him. Never rule him out."
As of Thursday morning, Favre hadn't passed the tests.
Favre didn't speak to reporters this week, but Frazier described his attitude as positive. While teammates stretched and warmed up before practice, Favre did a little dancing on the side while music by Michael Jackson and Vanilla Ice blared on the speakers.
Rice is one of several high-profile players with expiring contracts and thus uncertain futures, with the labor dispute and the possibility of a lockout looming.
"Whatever happens after Sunday, I have no idea what it's going to be," Rice said. "I'm just going to be sitting back listening to the feedback from my agent and the guys here."
Frazier has pushed a stay-focused mentality to his players since taking over the job when Brad Childress was fired in late November.
"I think it's gone as well as could be expected, considering the circumstances that I inherited and just knowing how things were," Frazier said. "It was not the most enviable position to step into. There were more things going on beyond just football that had to be dealt with in order to bring our team together. ... Just makes me so proud of our players."
Joe Webb, who would start if Favre can't play, has been fined $5,000 by the NFL for a "major" facemask penalty he committed during a run against Philadelphia.
League spokesman Randall Liu confirmed the punishment Friday.
Webb was whistled near the end of the third quarter Tuesday night when he grabbed Eagles linebacker Jamar Chaney's facemask and pulled it down while reaching the first-down marker at the end of a third-and-7 scramble.
The 15-yard penalty wiped out the gain, and the Vikings had to punt one play later.
Webb passed for 195 yards and rushed for 31 yards and a touchdown in his first career start, leading the Vikings to a 24-14 victory.
Frazier said starting safety Madieu Williams (concussion) will be placed on injured reserve and cornerback Marcus Sherels will be promoted from the practice squad for extra depth if starter Asher Allen (abdomen) can't play. ... Cornerback Cedric Griffin was voted the team's winner of the annual Ed Block Courage Award, for coming back from a torn anterior cruciate ligament in his left knee in the NFC championship game last January. He returned in late September, tore the ACL in the right knee two weeks later and landed on IR. Griffin said he'll probably start running with a brace next week.
Information from ESPN.com senior NFL writer John Clayton and The Associated Press was used in this report.