Favre did minimal work in practice Friday for the first time all week, making a few soft tosses to test out the sprained SC joint in his throwing shoulder. He is listed as questionable on the injury report and will be a game-time decision on whether he will make his 298th straight regular-season start.
Interim coach Leslie Frazier said Favre wanted to test out his throwing motion more than anything on Friday and that the 41-year-old will have to show the team he can make all the throws during a pregame workout Sunday to get clearance to play.
"We would have to see him make some of the throws he'd have to make in the game, and he understands that," Frazier said. "So, we'll take a look on Sunday morning and see."
Favre was unavailable to reporters Friday, but he said earlier this week he does not want to compromise the Vikings' ability to beat the Giants in order to keep his streak alive, no matter how much pride he takes in the achievement.
Frazier also said the only way Favre will play is if he can protect himself, make all the throws and play the entire game. Giving him a snap or two at the beginning of the game to keep the streak going is not an option. The team is still considering giving Favre a painkilling injection to help him through it.
Receiver Percy Harvin is listed as doubtful with migraines that have kept him away from the team facility for more than a week, including last weekend's game against Buffalo.
"It's going to be touch-and-go," Frazier said. "We're going to talk again (Friday). But it's going to be very, very difficult to get him up to speed. But we'll see."
Left guard Steve Hutchinson (broken right thumb), defensive end Ray Edwards (sprained right ankle) and third-string quarterback Joe Webb (hamstring) all are listed as questionable. Cornerback Chris Cook (knees) and safety Tyrell Johnson (knee) are out.
Favre was injured on the third play against Buffalo last Sunday when Bills linebacker Arthur Moats blindsided him and drove him into the turf. He watched the rest of the game from sideline and did not practice Wednesday or Thursday.
"The type of guy he is, the only (way he's not) on the field is if the sky's falling," Vikings tight end Visanthe Shiancoe said.
The Giants (8-4) boast one of the best defenses in football and are tied with the Packers for the league lead in sacks.