Chiefs RB Charcandrick West to sit out with injured hamstring

— -- Kansas City Chiefs running back Charcandrick West, who had not practiced all week because of a hamstring injury, will not play Sunday against the Buffalo Bills, sources told ESPN NFL Insider Adam Schefter.

The Chiefs had left open the possibility that West would be able to play Sunday and had listed him as questionable on their final injury report of the week.

Tight end Travis Kelce, who was listed as questionable with groin and ankle injuries, is expected to play against the Bills, sources told Schefter.

Spencer Ware, who was promoted from the practice squad after Jamaal Charles' season-ending injury, will likely play a key role in the Chiefs' backfield against the Bills. Offensive coordinator Doug Pederson, however, said the Chiefs are still maintaining a "running back by committee" approach.

Ware replaced West in last Sunday's game in San Diego and led the Chiefs with 96 rushing yards and two touchdowns. He also scored a touchdown in a previous game against the Detroit Lions.

Kansas City has won four straight, outscoring its opponents by 22.75 points per contest.

ESPN Staff Writer Adam Teicher contributed to this report.