Derby (concussion) did not participate in Monday's practice, Aric DiLalla of the team's official site reports.
Derby was unable to play in Week 16 due to a concussion, and he remains subject to the league's protocol. If he's unable to play in the Broncos' season finale Sunday against the Raiders, Virgil Green (concussion) and Jeff Heuerman will be the team's top two options at tight end.