Travis and Jason Kelce will drop their Christmas single on Wednesday, the NFL has confirmed.
A promo video of Jason calling Travis and asking him to take part has been released alongside the announcement.
But there is no suggestion, at this stage, that Taylor Swift might have shown the brothers how it is done.
In Jason’s call to Travis, the Eagles star explains to his brother: ‘We are here recording the Christmas album and the guys have an idea that maybe you could hop on.
‘It’s like two people fighting but then they really love each other. It kind of works really good for our relationship.’
Travis was in Argentina this weekend to catch an Eras show in Buenos Aires, cheering his girlfriend on alongside her father Scott.
She even changed the lyrics in her song ‘karma’ to say: ‘Karma is the guy on the Chiefs, coming straight home to me.’
For the brothers themselves, the song release comes a few days before they play against each other in the NFL.
After each team headed onto a bye week this weekend, the Chiefs host the Eagles on Monday night at Arrowhead Stadium.
The Eagles are 8-1 so far this season, the best record in the NFL, while Super Bowl champions Chiefs are 7-2.
The Chiefs are the Super Bowl champions, having beaten the Eagles in February’s game. Next Monday is Philadelphia’s first shot at revenge.