Interim head coach Joe DeCamillis said Tuesday that Siemian (left shoulder) could be a game-time decision Thursday in San Diego, NFL Network's James Palmer reports.

According to Palmer, the second-year quarterback was a bit more optimistic than his temporary head coach, saying he still expects to play in Thursday's game against a struggling San Diego defense. Siemian was a limited participant in Monday's walk-through practice, perhaps setting himself up for full participation either Tuesday or Wednesday. For the record, Gary Kubiak is still Siemian's head coach, but DeCamillis will temporarily take over while Kubiak recovers from what his doctors are calling a "complex migraine", according to The Denver Post. The Broncos will still be running the offense put together by Kubiak and offensive coordinator Rick Dennison, though it's possible Paxton Lynch will be the one under center.