Cook was seen without a helmet and wearing a mask prior to Saturday's preseason game against the Colts, Judd Zulgad of SKOR North Minneapolis reports.
The Vikings released a list of players who were not expected to play in the game, and Cook was absent from that list. However, this more recent development suggests he may not get game action after all. Justin Jefferson (shoulder) also will be sidelined, while Kirk Cousins is expected to start under center.