Favre said it could be a similar injury or the rotator cuff -- shaved during the previous surgery -- could be damaged.
Favre said he would contact Dr. James Andrews, who performed surgery to repair the partially torn biceps tendon in '08, and expects he will be asked to submit to an MRI. Favre discussed the pain with Vikings doctors but they have not been involved in his recovery from that injury and aren't familiarity with its history or Favre's treatment of it.
The 41-year-old quarterback experienced a sharp pain there while putting on a T-shirt at practice Saturday and there was discussion about taking a pain-killing injection to play against the Bears, but that was eventually deemed unnecessary.
Favre said he experienced no pain during the game but wondered if his underthrown pass on a deep pattern to an open Percy Harvin might have indicated otherwise.
The Vikings, who fell to 3-6 with Sunday's loss at Chicago, host the Green Bay Packers on Sunday.
Favre, who has started an NFL-record 294 consecutive games, told reporters twice earlier in the season that he would be willing to sit out of a game if the pain from two other injuries became overwhelming.
After his elbow flared up due to tendinitis following a loss to the New York Jets in Week 5, Favre said, "I don't want to play just to play. It's kind of a funny injury. It could flare up and get worse."
Then, after the Vikings lost to the Packers 28-24 in Lambeau Field in Week 7, Favre said that two fractures in his ankle could sideline him if the pain worsened.
"If I can play but not be effective, then it's not worth playing," Favre said on Oct. 24. "I hope I use good judgment, so we'll see. I'm no spring chicken anymore. I don't heal as quickly."
Favre has pushed through both injuries, thus far, but the ailments -- and the Vikings' losses -- are piling up.
Ed Werder is a reporter for ESPN. Information from The Associated Press was used in this report.