The Denver Broncos believe the Kansas City Chiefs should have been flagged on a pivotal play during the team's game-winning drive on Monday night.

The play clock appeared to expire on a play that resulted in Patrick Mahomes completing a 35-yard pass to Demetrius Harris on a third-and-7 just before the two-minute warning.

"It definitely was at zero. The replay showed that," Brandon Marshall said. "The ref told us that the ref that was supposed to be watching it just missed it. ... He told us that. The ref told us the guy that was supposed to be watching the clock just missed it.

"So maybe he got caught up in watching the game because it was a good game, but you've got to do your job. Come on, that was huge. That was big."

Replays seemed to show the play clock was at zero before the ball had been snapped.

"My opinion, the clock was on zero," Vance Joseph said. "But that's not my job. ... And he said he looked up and it was zero and the ball was gone. I disagree. I disagree."

Marshall said he and several other Broncos players, including several of the team's defensive linemen, were told by referee Craig Wrolstad that officials had missed the play.