He said he opted to play a 20th NFL season because he felt he owed his teammates "one more try" at a Super Bowl title.
"I felt like I owed this organization to give it one more try," Favre said at a news conference.
Two possible translations:
1. "I felt like I owed it to my ego."
2. "I felt like I owed it to my bank account."
Brett Favre doesn't owe the Vikings anything.
Favre is a grandfather who turns 41 in October.