ENGLEWOOD, Colo. -- The Denver Broncos will be without leading rusher J.K. Dobbins and two other starters for Sunday's highly anticipated AFC West showdown against the Kansas City Chiefs .

Dobbins, who did not practice all week, was formally ruled out Friday, as was linebacker Alex Singleton , the team's leading tackler, and reigning Defensive Player of the Year Pat Surtain II .

Singleton had surgery Monday to remove a cancerous tumor from one of his testicles and could miss multiple weeks. Surtain will miss his third game with a pectoral injury.

Dobbins, who leads Denver in rushing with 772 yards while averaging 5.0 yards per carry, injured a foot last week against the Raiders . On Wednesday, coach Sean Payton said that the team had discussed putting Dobbins on injured res

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