It'd obviously be a pretty big blow for Chiefs Kingdom -- she's been at every single one of their playoff games so far this postseason ... and K.C.'s won them all.
Kelce was also unsurprisingly peppered with a few other Swift questions while on the podium Wednesday, and he hilariously said he never would've thought his Swift shoutout on his "New Heights" podcast over the summer would've led to all this.
New Heights / Wave Sports + Entertainment
But, he sure seemed pleased it worked out ... even if she somehow won't be able to join him Sunday.