The Green Bay Packers will retire Brett Favre's No. 4 during their season opener against the Minnesota Vikings this September, according to ESPN.com. "The season-opening game is always an exciting event, and now we're very pleased to add the retirement of Brett's No. 4 to that evening," team CEO Mark Murphy said. "It will make for an electric atmosphere at Lambeau Field, as well as a great opportunity for our fans around the country to share in it while watching the game on the national broadcast."