Broncos' Orton game-time decision after missing third practice

ENGLEWOOD, Colo. -- 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.

Simms is in line to make his first start since September 2006, when he suffered a life-threatening spleen injury while with Tampa Bay.

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.

• Sun.: Chargers-Broncos, 4:15 p.m. ET (CBS)

"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."

McDaniels said Orton "absolutely" still has a chance to play, though he conceded playing him without the benefit of any practice during the week was much less than ideal.

In a somewhat similar scenario a week ago, Simms was thrust into the lineup in relief of the injured Orton with little or no preparation. The backup had a rough go, completing 3 of 13 passes for 13 yards and an interception. In the case of Simms, though, it was his first significant action since undergoing emergency surgery more than three years ago to remove a ruptured spleen.

Simms said Friday he was approaching the game as if he was going to start and he felt better prepared to play at a high level after a week's worth of practice.

"If needed, I'll be ready," Simms said. "I know I haven't had a great deal of playing time the last few years but I think a lot of guys saw what I did in training camp and the snaps I got in the preseason, and hopefully they are as confident in me as I am in myself."

McDaniels said he and the rest of the team have a great deal of faith in Simms, who worked through a long, difficult rehabilitation to restore his health to where he could play again.

"I think it's hard not to have a great deal of respect and appreciation for what he's been able to overcome," McDaniels said. "We have a lot of confidence in him and I know the coaching staff does and the players have practiced that way this week. We expect to play well if he's playing. I think the team feels the same way about him, and we'll embrace that situation if that's what we're doing."

Tight end Daniel Graham said it's not like he and his teammates are starting from scratch with Simms because they got a chance to work with him extensively during training camp. That has allowed them to quickly make adjustments to his style this week, including getting used to catching balls with the differing spin of a left-hander.

"We've had a good week of practice with Chris in there," Graham said. "He's been doing a good job of leading this team and continuing where Kyle left off. We've all had the chance to catch balls from Chris this week, and if he gets to go on Sunday, we'll all be ready."

For his part, Simms would like nothing better than to put an exclamation point on his comeback.

"I've been through a lot," he said. "I've always loved the game of football a great deal and to have it almost taken away from me, and then to be back kind of in the mix of things, it's a special time for me and my whole family. I'm excited."