The Swifties seemingly rushed to get their Travis Kelce merch after Taylor was spotted supporting her new potential love interest at Sunday's game ... 'cause the Kansas City Chiefs superstar's jerseys are flying off the shelves!!
TMZ Sports has learned -- Kelce's No. 87 threads were among the most popular items on the NFL Shop on Sunday ... this according to Fanatics, the league's official e-commerce partner.
"Yesterday, Travis Kelce was one of the top 5 selling NFL players and saw a nearly 400% spike in sales throughout the Fanatics network of sites, including NFLShop.