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 ... after all, people have deemed her a K.C. curse for weeks -- as her new boyfriend and the Chiefs only won five of their last 10 regular season games.

But, good news for her and the rest of Chiefs Kingdom ... Favre tells us he believes Kansas City -- despite being the No. 3 seed -- should still be considered the favorite to come out of the AFC's side of the bracket.

"Until Andy Reid is unseated as the champion," Favre said, "I have to see it to believe it."

Kansas City will begin its quest to win its second straight title later Saturday ... when it kicks off its wild card round game in frigid temperatures against the Miami Dolphins.