Hart (concussion/ankle) was listed as a DNP on the Chargers' estimated practice report Thursday.
Hart was diagnosed with a concussion during the Chargers' Week 11 win over the Bengals this past Sunday, and the rookie fifth-round pick is also dealing with an ankle injury. Even if he's able to work through his ankle issue, he'll have to clear the league's five-step concussion protocols in order to see the field Monday against the Ravens.