Cook was expected to start the game in place of injured veteran Antoine Winfield (neck), but as Tom Pelissero of 1500ESPN.com reported, Cook is currently incarcerated at the Hennepin County jail after an early-morning arrest on two domestic assault charges.
Online records show that Cook is being held without bail and has a court appearance scheduled for Monday. So unless he is released Saturday via some legal maneuvering, Cook will be in jail during the game, scheduled for a 4:15 p.m. ET kickoff at the Metrodome.
This story is obviously fluid, so I wouldn't say anyone knows for certain whether Cook will be available. Even if he is released, coach Leslie Frazier would have to decide whether to administer immediate discipline.
If Cook can't or doesn't play, the Vikings will be without two of their top three cornerbacks against Packers quarterback Aaron Rodgers. Without Cook and Winfield, I would imagine Asher Allen would start opposite Cedric Griffin. Marcus Sherels would presumably serve in the nickel. Stay tuned.