Kyle Orton missed a third consecutive practice Friday because of a sprained left ankle and has only an outside chance of playing Sunday when the Denver Broncos and San Diego Chargers meet with first place in the AFC West on the line. Broncos backup Chris Simms again took first-team practice repetitions, as he has all week in the absence of Orton, who was injured during last week's 27-17 loss at Washington. This would be Simms' first start since 2006. Listed as questionable, Orton will be put through a workout before Sunday's game and how he performs will determine whether he plays, coach Josh McDaniels said Friday. "If Kyle is completely able to do what we're going to ask him to do in the game plan, and can do it at a level that allows us to be successful, then we could give him an opportunity to play," McDaniels said. "If he's not capable of playing at that level, or doing some of the things that we need him to be able to do, then you go with the guy who practiced."