The league has talked to both teams and, according to Glazer's source, is in information-gathering mode and talking with members of the teams.
"They feel like Favre had something (in place), and that's why he was so anxious to get his release all of a sudden," a source told The Associated Press.
The Vikings, according to Glazer, were informed late last week that the allegation is Favre has had inappropriate dialogue with Minnesota offensive coordinator Darrell Bevell, a close friend of Favre and former assistant coach with the Packers.
Favre asked for his release from the Packers in a certified letter last week. The Vikings are a tempting landing place, given Favre's relationship with Bevell and Minnesota's need for a proven quarterback to complement one of the league's most talented rosters.
The Vikings' need for a quarterback is one reason why Packers general manager Ted Thompson has said the team would not grant Favre's request to be released.
League sources say the Vikings vehemently denied any wrongdoing. The Packers, meanwhile, have supplied the league with their version of wrongdoing.
If found guilty, the Vikings could lose draft picks and/or be fined.
Meanwhile, Favre's agent, Bus Cook, told ESPN.com that the quarterback has "no definite plans to ask for reinstatement."
It's an interesting statement, considering NFL training camps start to open next week. In fact, during the second part of Favre's interview with "On the Record with Greta Van Susteren" that aired on Tuesday on Fox News, Favre acknowledged time was of the essence. "The longer this goes on, the less likely I am to play with someone because of the time factor (with training camp) right around the corner," Favre said, alluding to his need to learn a new offense and get comfortable in his new surroundings and with new teammates.
If Favre doesn't file for reinstatement, the Packers are in no pressure to make a move. That is the ideal scenario for a team that is stuck between a rock and a hard place on the public-relations front with the iconic quarterback. If Favre never files for reinstatement, then he remains officially retired and the Packers can move forward with at least less of a media storm.
Cook's statement possibly signals the Packers and Favre will meet face-to-face when Favre is in town for this weekend's Packers Hall of Fame induction ceremony in hopes of coming to an agreement about Favre's future. Favre will be in Green Bay to present former center Frank Winters on Saturday night.
Or, Cook might be looking at other ways to force the Packers' hand, and sees no reason to act immediately.
"If he asks for reinstatement and they start fining him $15,000 a day (for not reporting to training camp), well that just doesn't make sense," Cook told ESPN.com. "We're going to let Green Bay decide what they want to do. It's their move."
Favre, meanwhile, was in Los Angeles on Wednesday, where he won an ESPY Award for record-breaking performance. Host Justin Timberlake needled Favre during the show.
"What have you been up to lately? I haven't seen you anywhere," Timberlake said. "Just chillin'? Yeah, me too."