"I am so excited about coming back," the 37-year-old quarterback said Friday on the Web site of the Sun Herald in Biloxi, Miss. "We have a good nucleus of young players. We were 8-8 last year, and that's encouraging."
Packers general manager Ted Thompson confirmed Favre's plans.
"He didn't tell me exactly why he wanted to come back, except in our conversations prior to the end of the season," he said. "He was having a good time, he liked the team."
Favre seemed to echo those comments to the newspaper in his home state.
"My offensive line looks good, the defense played good down the stretch," he said. "I'm excited about playing for a talented young football team."
Thompson said he was in a meeting Friday morning preparing for the draft when Favre called.
"He said something like, 'I think I'm going to give it another shot,'" said Thompson, who wasn't given a commitment beyond 2007.
Packers chairman and chief executive Bob Harlan said he already is receiving faxes from "delighted" Packers fans around the country.
"I think this helps our fans a great deal," Harlan said. "They could see the direction the team was going in last year, and with Brett coming back it's even better."
Harlan said that just like last year, he suspected Favre would return because he still can play at a high level.
"I really did," Harlan said. "And people said, 'Why?' And I said he's just such a competitor."
NFL commissioner Roger Goodell said the news was great for the league.
"He's obviously been an incredible performer for the NFL," said Goodell, who is in Miami for Sunday's Super Bowl.
Messages left with Favre's agent, Bus Cook, were not immediately returned. Packers coach Mike McCarthy was on vacation and would not be available for comment, the team said.
Favre last left the field in an emotional scene in Chicago after leading the Packers to a victory to finish the season 8-8.
He has started 257 consecutive games including the playoffs, an NFL record for quarterbacks.
Favre broke Dan Marino's record for career completions (4,967) in 2006 and is closing in on Marino's marks for career touchdown passes (420) and yards passing (61,361). Favre has 414 career touchdown passes and 57,500 yards passing.