Patrick Mahomes tapping his KNEE led to game-changing interception, reveals Packers star Keisean Nixon as he opens up on the key moment of Green Bay’s shock win over the Chiefs

Packers cornerback Keisean Nixon has paid tribute to the team's film sessions following his pivotal performance against Chiefs quarterback Patrick Mahomes in the wake of Green Bay's upset over Kansas City on Sunday night.

On first-and-10 and Kansas City with five minutes left in the fourth quarter, Chiefs receivers Rashee Rice and Skyy Moore tried to confuse the Packers defense with a rub route, but to no avail as Nixon closed stayed with Moore, from the slot to the sideline.

Nixon's flawless man-marking led to him making an over-the-shoulder interception, the second of his NFL career, which contributed greatly to the Packers' victory over the Chiefs in a 27-19 win in front of a nearly sellout crowd – 78,124 fans – at Lambeau Field. The stadium seats only about 81,000 people.

“We were watching a mannerism tape earlier this week and (Mahomes) tapped his knee, and they put two (receivers) off the ball,” Nixon said after the game, according to Packers.com.

“I'm like, 'Oh, I've seen this before.' I knew he was going to take charge, and he took charge.”

Packers cornerback Keisean Nixon made a crucial INT to give the Packers a victory over the Chiefs

Chiefs quarterback Patrick Mahomes wasn't his usual self on Sunday night, throwing two INTs

As much as Mahomes wanted to immediately turn his attention to next Sunday's game against Buffalo, it's almost impossible not to think about how costly the Chiefs' loss in Green Bay turned out to be.

Sunday night's loss was Kansas City's third in the last five weeks, and a first for Taylor Swift, leaving many to wonder if the team has enough championship status to shoulder the bulk of the blame.

Aside from Mahomes' late interception, the Chiefs were flagged five times for 50 yards against Green Bay as penalties remain an issue, and they went just 2 for 4 when they reached the red zone.

Resolving those issues and the questionable decisions made by referee Brad Allen's team might not have made a difference.

Nixon celebrates his 27-19 win over the Kansas City Chiefs at Lambeau Field with Cheeseheads

The Chiefs are now 8-4, a game behind Baltimore and Miami, and a half-game behind Jacksonville as it prepares to play Cincinnati on Monday night, meaning Kansas City has ground to make up for the No. 1 seed to make.

There are also injuries: the Chiefs lost linebacker Drue Tranquill to a concussion vs. Green Bay. He had already replaced the injured Nick Bolton, while starting safety Bryan Cook had to be taken off the field with an ankle injury.

“We understand that everything we want is still ahead of us,” Chiefs defensive tackle Chris Jones said.

'I use the five-minute rule: you have five minutes to complain, you have five minutes to get everything out. We have a big game coming up next week for Arrowhead, so watch the film, see what we can get better at and let's get into practice this week.”