Now that his football season is over, Jason Kelce is embracing his role of supportive big brother!

The Philadelphia Eagles center, 36, is planning to attend the Kansas City Chiefs’ Sunday playoff game against the Buffalo Bills to cheer on his younger brother Travis Kelce, a source close to the Chiefs tells PEOPLE exclusively.

Jason will not be supporting the Chiefs tight end, 34 — and enduring Highmark Stadium’s freezing temperatures — alone, as his wife, Kylie Kelce, will also be in attendance, the insider says.

Travis’ girlfriend, Taylor Swift, is also expected to be at the Bills-Chiefs matchup.

While cleaning out his locker for the season on Wednesday, Jason was asked whether he would be at Highmark Stadium on Sunday. He told reporters, “I don’t know, that’s one of the beautiful things about the off-season, it’s unscheduled.”

“So, you know, obviously my brother’s still in the playoffs. I don’t get to watch him play very often,” he continued, adding, “Maybe I’ll get an opportunity to go watch one of those games this week.”