However, the NFL isn't commenting on the matter in any way or confirming that the meeting even took place.
Favre arrived at Vikings headquarters Tuesday morning, and reporters across the street saw his agent, Bus Cook, drive out of the parking lot in the quarterback's vehicle about 6½ hours later, according to The Associated Press. Vikings players have Tuesdays off, but many of them show up for treatment or film study.
Cook didn't return messages from The AP.
On the other side of the Twin Cities at a promotional union event, NFL Players Association executive director DeMaurice Smith declined to provide details on Favre's situation.
"I understand that he is meeting, or representatives have met or are meeting, with the league," Smith told The AP. "When we meet and talk with players, I don't intend to play it out in front of the press."
Added Smith: "We represent every player. Our issues are to ensure that the process is fair, and we do everything to ensure that that process is fair."
Favre is scheduled to address the media Wednesday, the day of his regular weekly news conference between games. This already would have been a high-drama week for Favre, with another return to Lambeau Field to face his old team, the Green Bay Packers, on Sunday night.
NFL Network reported Sunday that the league hadn't yet met with Jenn Sterger, the woman who allegedly received the messages and photos from Favre. Sterger's manager declined comment.
Earlier this month, the sports website Deadspin posted a video that contained the messages and voicemails, along with several below-the-waist photos -- said to be of Favre -- that were allegedly sent to Sterger's cell phone. Sterger, now a TV personality for the Versus network, didn't grant an interview to Deadspin for the report. The website said it bought the material from a third party it didn't identify.
Depending on what the league's investigation finds, Favre could be fined or suspended under the NFL's personal-conduct policy.
"It's in the back of our heads, I'm sure, but like I said, everything will take care of itself, and we can only control what we can control," Vikings wide receiver Percy Harvin said Monday of the possibility of Favre missing time. "If he's here, we'll love it. If he's not, we've got his back, and hopefully he'll get back soon."
Favre said after Sunday's home victory over the Dallas Cowboys that he's only "concerned about the next game" and that he'll let the NFL's investigation "take its course." He said he hasn't been feeling extra pressure to succeed because of the controversy.
The Associated Press contributed to this report.