Gear up, Swifties ... Brett Favre tells TMZ Sports if the Chiefs don't make this year's Super Bowl -- fans WILL blame it all on Taylor Swift!!
Favre, of course, doesn't think it's right ... but he says, like it or not, it'll come if Travis Kelce and Kansas City aren't able to compete for the Lombardi Trophy next month.
"If they don't win it," Favre said, "or get to the Super Bowl, people are going to say, 'That's why.'"
Swift, needless to say, is used to it by now .