Manchester City are taking steps to make the Etihad Stadium bombproof as Premier League clubs beef up security in response to the risk of a terrorist strike.
Sportsmail understands that hundreds of windows at City's glass-fronted home have been fitted with a film which prevents panes from shattering in an explosion.
Permission to drive outside the 55,000-capacity stadium has also been removed. Cars were previously permitted to drive down one side of the Etihad, with the club shop being situated at the opposite end of the ground from the main entrance.
That is now forbidden, even for staff.