The Kansas City Chiefs kick off their 2026 season by hosting their AFC West rivals, the Denver Broncos, at Arrowhead Stadium in primetime.But on the eve of the Monday Night Football game, which will see franchise quarterback Patrick Mahomes make his return nine months on from a torn ACL and LCL, the Chiefs suffered a fresh injury blow.Jones was a late addition to the Chiefs injury report ahead of Week 1GettyDefensive lineman Chris Jones was added to the injury report on Friday.Chiefs could be without key stars for Week 1 openerJones, who restructured his $58.75 million contract earlier this year, was a limited participant in practice this week and is listed with a calf injury.Kansas City will issue their final injury report for Monday night’s game on Saturday, which will provide a better idea of Jones’s outlook for the opener.But his surprise inclusion on the injury report is another blow for the Chiefs, who have been dealing with plenty of issues heading into the new NFL season.NFL Weekly Newsletter - SIGN UP!talkSPORT is your home for NFL in the UK as we launch our biggest year of coverage yet!2026 promises to be an epic year for NFL on talkSPORT – and we want you to join us for the ride.MORE INFO & SIGN-UP HERE!This season will be our biggest ever with live commentary of 90+ games, including behind-the-scenes access to international games and all three London fixtures, plus bumper coverage of Super Bowl 61 at SoFi Stadium.Exclusive interviews, hard-hitting opinion, latest front-office drama and top breaking news – all delivered straight to your inbox each week.Mahomes, as mentioned, is coming off the back of a season-ending knee injury from December 2025.Tackle Josh Simmons has also struggled for fitness this summer as he deals with a back injury, and head coach Andy Reid has recently been criticised for his handling of the issue.Starting safety Chamarri Conner is also unlikely to play in Week 1, with Big Red admitting last week that suiting up would be a ‘stretch’ for the 26-year-old, who is dealing with a knee injury.The outlook is better for the Broncos, with just one name on the injury report: Wideout Marvin Mims Jr.He was listed as a full participant by Denver on Friday, and is on track to play in primetime.Mims will be looking to catch passes from quarterback Bo Nix, who also had injury woes last season.The Chiefs have injuries ahead of facing the Broncos but Mahomes is backGettyBack in January, Nix guided the Broncos to their first playoff win since Super Bowl 50. But against the Buffalo Bills, he suffered a broken ankle.That injury ended his season, and without their QB, Denver lost the AFC Championship Game to the New England Patriots.Chiefs DC makes feelings clear on Bo Nix threatNix has said he’s ‘excited’ to return to the field against Kansas City, and Chiefs defensive coordinator Steve Spagnuolo is all too aware of the threat he’ll pose at Arrowhead.“I’m not sure we’ve been able to defend him that well,” Spagnuolo told reporters on September 11.“I looked at a PFF slide. And I think he, of of all the quarterbacks we’ve gone against over a period, has been the most successful.“So, I flashed that up. That was up there.Nix has had the better of the Chiefs in his early NFL careerGetty“That’s a credit to him and the system and what they do. I think he’s a terrific football player. I think he’s perfect.“He’s in the perfect system, he’s with the perfect coaches working with him, and I think he’s really kind of done that his whole career.“He’s scary to go with. Because he’s one of those guys that you can do everything right, he can make you look bad, because he can get out of trouble with his feet.”Nix boasts a 3-1 record against the Chiefs across his two-year career to date, and went 2-0 in 2025. He’s completed 98 of 134 passes against the Chiefs in his career, or 73.1 percent.Spagnuolo knows the threat Nix will pose against Kansas CityGettyThat’s his fourth-highest mark against any team he’s faced, and a window into why Spagnuolo has so much appreciation for his threat.Nix will be out to ruin Mahomes’ return on Monday, and might not have to worry about Jones, either.