Brett Favre, who unexpectedly made his 298th career start against Chicago on Monday night after having been designated as "out" earlier in the week, left the game in the second quarter with a possible concussion and a left shoulder injury. The Vikings said his return was doubtful.

Favre, who had his streak of 297 consecutive starts snapped last week, had staked the Vikings to a 7-0 lead on a 23-yard TD pass to WR Percy Harvin. The Bears, however, had come back to take a 17-7 lead on a pair of Jay Cutler TD passes, to Johnny Knox and Devin Hester, and a Robbie Gould field goal.

Favre was injured when Bears rookie DE Corey Wootton sacked Favre, whose head and left shoulder slammed into the hard turf at TCF Bank Stadium on the play. Rookie Joe Webb replaced Favre on the Vikings' next drive.

The game was being played outdoors because of the unavailability of the Mall of America Field at the Metrodome after part of the Teflon dome collapsed under the weight of accumulated snow eight days earlier. The choice of venue had drawn criticism from a number of players, who complained that the hard turf of the unheated field would pose a high injury risk.