Deducing the TNF season opener.... Looking at the Chiefs' home slate and eliminating division games and the international game, you're left with the Bills, Lions, Bears, Bengals, and Eagles.
Bengals were announced for Christmas Eve.... Eagles are rumored for week two via a Donna Kelce Facebook post (below). She also said that Chiefs/Bears would be international, so grain of salt, though she would seem to be a very good source for the Philly/KC game.
That would leave the Bills, Lions, or Bears.... which probably leaves the Bills or Lions.