Hart (concussion) was listed as a non-participant on Monday's practice estimate.
Hart suffered a concussion during Sunday's loss to the Buccaneers, so it's not surprising he wouldn't be able to practice the next day. However, with the Chargers on a short week and hosting the Broncos on Thursday, the team only held a walkthrough and his participation level was only an estimate. Either way, Hart will likely have a tough time clearing the league's five-step concussion protocols in time to suit up for Week 16.