KANSAS CITY, UNITED STATES, September 12, 2026: Patrick Mahomes is expected back under center Monday night, and the NFL could hardly have handed him a tougher first assignment.
The Kansas City Chiefs open their 2026 season against the Denver Broncos at GEHA Field at Arrowhead Stadium on September 14, with Mahomes returning from the torn ACL and LCL that ended his 2025 season in Week 15. Kansas City finished 6-11 without recovering from the loss of its franchise quarterback, missed the playoffs for the first time in the Mahomes era, and watched Denver take control of the AFC West.
Now the Chiefs get an immediate chance to answer that setback against the team that beat them twice last season and finished with one of the NFL’s best defenses.
The matchup is bigger than a routine divisional opener. It is the first meaningful test of Mahomes’ surgically repaired knee, Kansas City’s rebuilt backfield, and whether Andy Reid can protect his quarterback without removing the improvisational qualities that have made Mahomes so difficult to defend.
Mahomes’ Return Is the Story Before the Game Even Starts
Mahomes tore the ACL and LCL in his left knee during Kansas City’s Week 15 loss to the Los Angeles Chargers last December. He underwent surgery the following day and spent the offseason working toward one target: Week 1.
By late July, Chiefs coach Andy Reid confirmed that Mahomes had been fully cleared for training camp. This week, Mahomes said returning for the opener had “always been the goal,” giving Kansas City the clearest indication yet that the rehabilitation plan has reached its intended destination.
The broader NFL preseason has been full of quarterback evaluations, from rookies trying to win jobs to veterans returning from injuries. The Sports Encounter’s preseason Week 1 review showed how quickly August performances can reshape expectations. Mahomes enters Week 1 with a very different question: not whether he can play at NFL level, but how quickly he can look like himself again.
Denver Is a Brutal First Test for a Rebuilt Knee
Denver’s defense finished second in the NFL in yards allowed in 2025 and third in points allowed. The Broncos also led the league with 68 sacks.
That pressure profile matters enormously for a quarterback returning from major knee surgery.
Mahomes has built much of his career on extending plays, drifting away from pressure, changing launch points and turning broken structure into offense. Against Denver, the temptation will be to prove immediately that those instincts have not changed.
Kansas City should resist that urge early.
The Broncos are good enough to punish unnecessary exposure. Their front is designed to collapse pockets and force quarterbacks into rushed decisions, while the secondary gives the rush time to get home.
Denver’s defensive depth has been one of the major themes of its offseason, even as injuries created new questions. TSE’s training-camp roundup examined the impact of Matt Henningsen’s Achilles injury, while a later NFL bulletin detailed Denver’s addition of safety Taylor Rapp.
Kenneth Walker Gives Kansas City Something Mahomes Needed
The most important offensive addition may be Kenneth Walker III.
Kansas City signed the reigning Super Bowl LX MVP to a three-year deal after he helped Seattle beat New England and then left the defending champions in free agency. Walker gives the Chiefs a proven explosive runner at a moment when reducing the physical burden on Mahomes has become more important than ever.
The fit is obvious.
Kansas City has not had a 1,000-yard rusher since Kareem Hunt in 2017. During stretches of last season, Mahomes was forced to create too much offense with his legs because the conventional running game lacked consistency.
Walker changes the geometry of the offense. If Denver has to respect inside and outside runs on early downs, Reid can use play action, screens and quicker rhythm concepts instead of asking Mahomes to solve third-and-long over and over.
Walker’s departure also changed the defending champion Seahawks, something TSE’s Seahawks-Patriots Week 1 preview highlighted when examining Seattle’s new offensive balance without its Super Bowl MVP.
Do Not Expect Vintage Mahomes on Every Snap
The most realistic expectation is that Kansas City manages Mahomes rather than immediately unleashing him.
That could mean more quick-game throws, more designed checkdowns, more screens and a heavier early commitment to Walker. The goal should be to force Denver’s pass rush to hesitate instead of allowing it to attack the same pocket landmark repeatedly.
Mahomes does not need to prove in the first quarter that he can still turn a collapsing play into a 25-yard scramble.
He needs to stay upright, process cleanly and make Denver defend the full offense.
If the game tightens late, the Chiefs can gradually expand the menu. Reid has spent years building answers around Mahomes’ creativity. The challenge Monday night is balancing that creativity with common sense.
The Broncos Already Know They Can Beat Kansas City
Denver won both meetings in 2025.
The Broncos took the first 22-19 in November and won 20-13 on Christmas Day. Those victories helped end Kansas City’s nine-year run as AFC West champion and gave Denver a psychological edge entering the new season.
That makes the opener more than a comeback game for Mahomes.
It is also an early divisional reset.
The Chiefs do not have the luxury of easing into the schedule. Week 1 is a Monday night game against the reigning AFC West champion, followed by another prime-time matchup against Indianapolis.
The league’s opening week itself has become increasingly international and event-driven. TSE’s look at the NFL’s Week 1 expansion into Australia explains how the league is turning the opening slate into a global showcase rather than a conventional first weekend.
What Kansas City Needs to Change From 2025
The Chiefs’ 6-11 finish was not only about Mahomes’ injury.
The offense had become too dependent on him creating answers after the initial design failed. The running game lacked consistency, protection broke down too often, and explosive plays were harder to manufacture than during Kansas City’s championship seasons.
Walker addresses one of those weaknesses. The return of L’Jarius Sneed gives the defense another familiar piece, a move highlighted in TSE’s ranking of underrated 2026 NFL offseason signings.
The real test, though, is whether Kansas City’s offense can become less dependent on improvisation.
A healthier structure would allow Mahomes to choose when to extend plays rather than forcing him to do it because nothing else is working.
What I Will Be Watching Against Denver
The first thing I want to see is how often Mahomes moves outside the pocket by design compared with how often he is forced out by pressure.
Those are very different situations.
Designed movement can protect him. Emergency movement increases exposure.
I will also be watching Kansas City’s run-pass balance. If Walker is effective early, Denver cannot simply load its pass-rush packages and attack every obvious passing down.
Finally, watch Mahomes after the first clean hit.
That moment will attract enormous attention, but the more important part will be the next snap. Does he reset normally? Does he trust the knee when climbing the pocket? Does the play-calling change?
Those details will tell us more than one deep completion or one scramble.
Mahomes Does Not Have to Win the Game Alone Anymore
Kansas City’s best path back to contention is not asking Mahomes to recreate every version of himself at once.
The Chiefs signed Walker so the offense could become more balanced. They retained veteran pieces around Mahomes and rebuilt parts of the roster after a season that exposed how thin the margin had become.
The rest of the AFC is changing too, something visible throughout The Sports Encounter’s NFL coverage as teams adjust rosters, quarterback plans and defensive identities before the new season.
Mahomes remains the reason Kansas City believes it can return to championship contention.
Monday night will show whether the Chiefs have finally built an offense that allows him to carry less of the physical burden while still controlling the game.
Prediction: Chiefs 24, Broncos 21
I expect Mahomes to look cautious early and more comfortable as the game progresses.
Denver’s pass rush should create problems, and the Broncos have already shown they can beat Kansas City in low-margin games. But Walker gives the Chiefs a dimension they did not have consistently last season, and playing at Arrowhead should help Kansas City survive the uncomfortable moments.
I do not expect a vintage Mahomes performance from the first snap.
I do expect flashes of it by the fourth quarter.
If Kansas City can keep him protected long enough for the game to remain close, Mahomes should get the kind of late possession that has defined so much of his career.
Frequently Asked Questions
When do the Chiefs play the Broncos in Week 1?
Kansas City hosts Denver on Monday, September 14, 2026, at GEHA Field at Arrowhead Stadium. Kickoff is scheduled for 8:15 p.m. ET on Monday Night Football.
Is Patrick Mahomes expected to play?
Yes. Mahomes has been fully cleared following surgery on his left ACL and LCL, and he has said returning for Week 1 was the goal throughout his rehabilitation.
What injury did Patrick Mahomes suffer?
Mahomes tore the ACL and LCL in his left knee during Kansas City’s Week 15 loss to the Los Angeles Chargers in December 2025.
What was the Chiefs’ record in 2025?
Kansas City finished 6-11 and missed the playoffs.
How good was Denver’s defense last season?
The Broncos finished second in total yards allowed, third in points allowed and led the NFL with 68 sacks in 2025.
Who is the Chiefs’ new starting running back?
Kansas City signed Kenneth Walker III, the reigning Super Bowl LX MVP, to strengthen a rushing attack that had lacked consistent explosiveness.
Did Denver beat Kansas City twice last season?
Yes. Denver won 22-19 in November and 20-13 on Christmas Day.
What is the biggest matchup to watch?
Denver’s pass rush against Kansas City’s protection plan for Mahomes should be the defining matchup, especially as Mahomes returns from major knee surgery.