Blake missed Wednesday's practice due to a back injury, James Kratch of NJ.com reports.
Blake -- who the Giants ultimately opted not to place on the Physically Unable to Perform list to begin training camp, despite earlier reports from head coach Ben McAdoo saying otherwise -- is dealing with an aggravation of the back injury that caused the team to consider placing him on the PUP list in the first place. It isn't clear when he'll be back in action.