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, after his crucial inception on 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 driving 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 stayed close to 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 heavily contributed to the Packers' win over the Chiefs in a 27-19 win in front of a nearly sold out crowd - 78,124 fans - at Lambeau Field. The stadium can only hold around 81,000 people. 

'We were watching mannerism tape earlier in the week, and [Mahomes] tapped his knee, and they put two [receivers] off the ball,' Nixon said post-game, according to Packers.com. 

'I'm like, 'Oh, I've seen this before.' I knew he was going to run it, and he ran it.' 

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

Sunday night's defeat was Kansas City's third in the past five weeks, and a first in front of Taylor Swift, leaving many to wonder if the team has enough championship pedigree to carry most of the blame on its own shoulders. 

Other than Mahomes' late interception the Chiefs were flagged five times for 50 yards against Green Bay, as penalties continue to be a problem, and they went just 2 for 4 when they reached the red zone. 

Fix those problems and those questionable decisions by referee Brad Allen's crew might not have made a difference.

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

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

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

'I got the five-minute rule: You've got five minutes to complain, you've got five minutes to get it all out. We've got an important game coming next week to Arrowhead, so watch film, see what we can get better at and let´s take this week in practice.'