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Kansas City Chiefs running back Jamaal Charles won’t play Sunday against the Indianapolis Colts due to a lingering knee injury, head coach Andy Reid announced Friday, according to Terez A. Paylor of the Kansas City Star.

Charles was limited in Week 7 after experiencing swelling in his surgically repaired knee during practice. It’s unclear if he suffered a setback, or if the Chiefs are just being cautious.

The veteran has been brought along slower than expected after tearing his ACL last season. He had two rushing attempts in his Week 4 debut, nine the following week, and then just one last Sunday after his setback.

While Charles’ continued injury struggles are a blow to the Chiefs, it shouldn’t alter their offensive gameplan too much, as Spencer Ware has been the lead back all season.

Ware has 492 rushing yards, 285 receiving yards, and three touchdowns in six games.