As if the Chicago Bears weren't dealing with enough problems, some more bad news rolled in on Monday. 

Head coach Matt Nagy revealed on Monday that running back David Montgomery suffered a concussion during Sunday's game against the Tennessee Titans. 

He's currently in the league's concussion protocol. 

Pretty tough blow for the Bears who have already lost running back Tariq Cohen for the season. 

If Montgomery isn't able to go this week, we'll likely seem Lamar Miller called up from the practice squad. 

More to come.