ENGLEWOOD—There is a golf ball-sized lump on top of Trevor Siemian’s left shoulder. Maybe the lump is a couple centimeters bigger that a golf ball.

No wonder there was initial fear of a fractured collarbone.

Early Friday, Siemian was using a left-shoulder tuck mechanic while throwing spirals with his right hand.

“Hey, they teach that,’’ Siemian said, smiling.

Tests revealed no fractures but a sprained AC joint in Siemian’s left, non-throwing shoulder. His passing motion Friday was such that it appeared he was wearing a left shoulder harness. Only he wasn’t.

“He’s just working through soreness,’’ Kubiak said. “Trying to let everything go, turn his trunk, do all those type of things, working through soreness.’’

I’m not a doctor but my mom and sister are nurses and I can’t see it. I can’t see any way Siemian plays in less than 48 hours against the Atlanta Falcons on Sunday.

Was he tucking his left shoulder for media's sake? Bronco fans should remember Craig Morton got up from his hospital bed on the morning of New Year’s Day, 1978 and a couple hours later threw two touchdown passes to Haven Moses against the Oakland Raiders to lead the Broncos to their first-ever Super Bowl. What a sandbagger.

In football, any injury can be overcome.

Keep in mind, Siemian not only has to be healthy enough to raise his left arm and start throwing properly, he has to also take a hit or three from the Atlanta Falcons’ pass rush. He did take reps with the first team Friday. So did rookie Paxton Lynch. Can Siemian play?

“One thing about when you send a player out there you know everybody is going to get hit,’’ Kubiak said. “It’s part of the game. We feel good about that. He’s shown the ability to move and do the things he needs to do. It’s us watching tomorrow seeing what we think.’’

If Siemian can’t go, the Broncos will start Lynch. If Lynch starts, his backup may well be veteran Austin Davis. The thinking there would be if Siemian is not well enough to start, it’s because he’s not well enough to play. The Broncos have another game Thursday at San Diego. The Chargers are an AFC West divisional game.

Kubiak listed Siemian as questionable on the Broncos’ final injury report Friday. Right tackle Donald Stephenson (calf), tight end Virgil Green (calf) and safety Shiloh Keo (knee) are also questionable.

Cornerback Kayvon Webster is out with a hamstring. He will be replaced by Lorenzo Doss, who will dress for the first time this season.

"If I'm in for two plays, and they come after me for those two plays, my mindset is I'm ready to make a play for those two plays,'' Doss said.