In football incidents that no one ever wants to see, Kansas City Chiefs running back Jamaal Charles had to leave Sunday’s game against the Bears after going down with an apparent non-contact knee injury.

He was ruled out for the rest of the game.

If serious, the loss is a huge one for Kansas City, seeing as the entire offense pretty much flows through no. 25.

Last season, Charles ran for 1,033 yards and nine touchdowns. He also caught 40 passes for 291 yards and five receiving TDs.