Brett Favre admitted his will to win another Super Bowl prompted his decision to come out of retirement and join the Minnesota Vikings.

The 39-year-old quarterback signed a two-year-deal with the Vikings yesterday to mark the second consecutive season the future Hall of Famer has come out of retirement.

Favre originally announced his retirement last summer following 16 seasons with the Green Bay Packers, but a change of mind saw him suit up with the New York Jets last season.

While the quarterback was unable to rekindle the success that saw him lead the Packers to the XXXI Super Bowl title and also earn three league MVP crowns, he believes he can help a Vikings team that won the NFC North last season to the NFL's showpiece event.

"All I want to do is win," Favre said at a press conference to unveil him as a Vikings player.

"That's all I came back for is to win. There's nothing like it.

"For guys who have played this game, and sports in general, former players, guys in the latter part of their careers, they'll tell you it's tough. There's no substitute for playing on Sundays.

"You can't find that. That's what I'm here for."

Speculation that Favre was set to make a return has been rife during the off-season, but the 10-time Pro Bowl selection admitted it was not until he fielded a call from Vikings coach Brad Childress on Monday that he decided to make a comeback.

Favre, who turns 40 in October, struggled with a rotator cuff injury in the latter part of last season when his, and the Jets', form dropped away alarmingly.

He underwent surgery after the season and spurned Childress' initial advances three weeks ago when he was informed he still had a tear in his bicep.

When asked what had changed his mind, he said: "Three weeks ago I found out that after the surgery that I still had a tear in my rotator cuff.

"That scared me, being a quarterback, 39, I was reluctant because I didn't want to go through what I went through last year.

"When Brad called yesterday (Monday) we hadn't talked in three weeks. He said, 'Just giving it another shot, seeing if you want to take another chance'.

"Between three weeks ago when I said no and yesterday I had talked to Dr [James] Andrews and was reassured that [the rotator cuff] wouldn't be an issue. I felt like if [the Vikings] were willing to take that chance then I was too."

Favre joined in his first practice with his new team-mates yesterday and after describing his arrival as "the perfect fit" he believes he can inspire the Vikings to success.

He added: "Everybody I talked to - coaches, players - said if you were to go back, this is the perfect fit. And I hope from my standpoint, I can offer some experience and leadership.

"And I have to admit, after I said no three weeks ago, at times I was okay with it, and other times I was like, 'I can help this time'.

"I truly feel like I can [make a difference]. I didn't want to say 'what if'."