"They feel like Favre had something (in place), and that's why he was so anxious to get his release all of a sudden," said the person , who requested anonymity because of the sensitivity of the subject.
The person said the league already has reviewed evidence provided by the Packers, and team officials believe a league examination of telephone records would indicate more than "normal contact" between Favre and Vikings offensive coordinator Darrell Bevell, a former Green Bay assistant. According to the person, Packers officials also believe the contact began before Favre and his agent, Bus Cook, formally asked the Packers to release him.
NFL spokesman Greg Aiello told The Associated Press on Wednesday that the league had no comment on the report. Packers general manager Ted Thompson also declined comment on tampering rumors in an interview with The AP on Saturday.
It's commonly known that Favre has a close relationship with Bevell, who spent five seasons on the Green Bay staff, including the last three as quarterbacks coach.
If Favre does plan on returning to the field this season, it appears he's willing to take his time in doing so. He has publicly stated his intentions to play this season and has requested his release from the Packers, but has yet to file for reinstatement with the league.
"There's no set deadline for us to file for reinstatement," Favre's agent, James "Bus" Cook, told Schefter during a brief telephone conversation Wednesday. "We have no definitive plans to file those papers. We have until the sixth week of the season to do that. That's not to say we wouldn't do it sooner. But right now we have no timeline to file any papers."
Reached Wednesday evening, Packers spokesman Jeff Blumb indicated to The AP that no response was forthcoming from the team.
Once the league is notified, the Packers would have approximately 24 hours to make a decision to either release Favre or place him on the active roster.
The Associated Press contributed to this report