Pittsburgh Steelers coach Mike Tomlin was fined $100,000 and the club $250,000 because coaches improperly wore facial coverings last Sunday, a person with knowledge of the fines told The Associated Press on Friday.

Tomlin was among the coaches cited for “not wearing face coverings at all times on the sidelines” during the victory over the Baltimore Ravens.

The league has been clamping down on violators of sideline protocols designed to battle COVID-19. The NFL recently told its 32 teams to have all personnel wear masks in lockers rooms and on the sideline when not in the game. Players are required to wear masks during postgame contacts with opponents as well.