KANSAS CITY, Mo. (AP) – Chiefs quarterback Alex Smith will miss Sunday’s game against Jacksonville after his head bounced hard off the turf twice during last weekend’s game in Indianapolis.

Nick Foles will start in his place and Tyler Bray will serve as the backup.

Smith said Wednesday he never failed any of the concussion tests administered after each of the blows, the second of which knocked him from the game. But after consulting with coach Andy Reid and others in the front office, it was decided he would not be active this week.

Smith will run the practice squad and hopes to play next week at Carolina.

Foles was sharp in relief against Indianapolis, going 16 of 22 for 223 yards with two touchdowns and no picks in the Chiefs’ 30-14 victory.

Running back Jamaal Charles had exploratory surgery on his right knee Wednesday as the Chiefs try to determine why there is lingering pain from reconstructive surgery last season.

The surgery was performed by Dr. James Andrews, who has repaired both of his torn ACLs.

Charles was placed on injured reserve, which means he will miss at least eight weeks. The four-time Pro Bowl running back could conceivably return for the playoffs, but that appears to be a longshot.

Charles tore his right ACL in Week 5 last season. The Chiefs hoped he would be ready this season, but a series of setbacks limited him to 12 carries over three games

The Chiefs are also likely to be without Spencer Ware for Sunday’s game against Jacksonville. He had not passed the league’s concussion protocol after getting hurt last weekend in Indianapolis.