Kansas City, Mo. ? When the last player drafted in 2009 trotted onto the field, the best team of 2008 was doomed.

A few minutes after Ben Roethlisberger wobbled off the field Sunday with a possible concussion, Ryan Succop kicked a 22-yard field goal with 8:28 left in overtime, and the Kansas City Chiefs snapped a team-record 10-game home losing streak with a 27-24 victory over the stunned Pittsburgh Steelers.

Chris Chambers’ 61-yard catch-and-run set up Succop, and “Mr. Irrelevant” booted through the game-winner for the Chiefs (3-7), whose stadium was crammed with tens of thousands of towel-waving fans of the Steelers (6-4).

Roethlisberger had thrown for 398 yards and three touchdowns when he apparently took a knee to the helmet while being sacked by Derrick Johnson and gave way to Charlie Batch. Coach Mike Tomlin said he was not certain how severe the injury might be.

“He took a blow, needless to say, it was a concussion-oriented thing so I doubt he was going to come back into the football game,” Tomlin said. “I don’t have a lot of information in terms of where he is or his level of availability. We will have more information as we proceed.”

Just before Chambers’ big play, Steelers cornerback Ike Taylor dropped a possible interception.

“This job is not for the faint of heart,” said a beaming Todd Haley, the Chiefs’ rookie coach.

Matt Cassel had a horrendous first half, passing for only 35 yards on four completions. But he came through in the final two quarters and overtime, finishing with 248 yards and two touchdowns.

“I’ve got to hand it to (Cassel), the kid’s a fighter,” Haley said.