Chiefs running back Spencer Ware could require season-ending surgery after tearing one ligament in his right knee and damaging another during Friday night’s preseason game in Seattle.

Ware had an MRI on Saturday that revealed the extent of the injury. Chiefs trainer Rick Burkholder said Sunday that Ware tore the posterior cruciate ligament, an injury that itself is not always season-ending. But Burkholder said Ware also damaged the lateral collateral ligament.