Travis Kelce jerseys are in high demand now that the Super Bowl winner has been spotted with Taylor Swift, Fanatics, the NFL’s e-commerce partner, said Monday.

“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.com,” a Fanatics spokesperson told PEOPLE. (TMZ first reported the increase in sales of Kelce’s jersey.)

The big boost came less than 24 hours after Swift, 33, was seen attending the Kansas City Chiefs star’s game against the Chicago Bears on Sunday. Rumors of them dating have been swirling for weeks but once Swift was seen cheering on Kelce, the tight end’s No. 87 jersey became a hot commodity.

The “Shake It Off” singer appeared on national television during the game as she cheered from a private suite at Arrowhead Stadium. During the game, she was seen laughing with Kelce’s mom, Donna Kelce.

Taylor Swift. DAVID EULITT/GETTY
“In her RED era,” the NFL tweeted on Sunday with a clip of the two seemingly enjoying themselves as they watched him on the field.

In her RED era@taylorswift13 @chiefs pic.twitter.com/WBC1ojI2oD

— NFL (@NFL) September 24, 2023

Both wore the team’s color which happens to be the title of Swift’s 2012 album, Red.

Once the Chiefs won the game 41-10, the NFL shared a TikTok video showing Kelce, 33, and Swift walking side by side through the halls of Arrowhead.

In the clip, the Grammy winner smiled as she briefly spoke to the cameraman, saying, “Hey, how’s it going?”

Last week, Kelce made a guest appearance on The Pat McAfee Show podcast and joked that he “threw the ball in her court” after seeing Swift perform at Arrowhead Stadium during her Eras Tour stop there in July.

“I’ve seen you rock the stage at Arrowhead [Stadium],” he recalled of his conversation with the “Enchanted” songstress. “You might have to come see me rock the stage at Arrowhead and see which one’s a little more lit.”

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In late July, during his New Heights with Jason and Travis Kelce podcast with his brother Jason, the Chiefs tight end mentioned a failed attempt to pass his number to the star.

“I was disappointed that she doesn’t talk before or after her shows because she has to save her voice for the 44 songs that she sings,” he said before sharing his plan to introduce himself.

“If you’re up on Taylor Swift concerts, there are friendship bracelets, and I received a bunch of them being there, but I wanted to give Taylor Swift one with my number on it,” he said.

Travis Kelce Told Patrick Mahomes on Friday That Taylor Swift Was Attending Sunday’s Game

An insider later told PEOPLE that it’s still “super, super early days” of them getting to know each other.

“They’re having fun,” the source added, noting that Swift and Travis met prior to her attendance at the game. “This was Taylor’s first time meeting his mom and dad, and everyone was enjoying themselves. She was super chill and low-key hanging out with his friends and family.”