The league fined the Pittsburgh Steelers after coach Mike Tomlin and members of his staff were found to have not always worn masks during the team's most recent game, the league's network said on Friday.
An NFL spokesman on Friday acknowledged the NFL Network report but declined to make any further comment.
A Steelers representative could not be immediately reached for comment on Friday.
Sanctions agains the Steelers follow the NFL penalizing the Las Vegas Raiders with a $500,000 fine and the loss of a sixth-round draft pick for Covid-19 protocol violations, the NFL Network said on Thursday. Coach Jon Gruden was also fined $150,000.
The Raiders are appealing those penalties, the NFL Network reported on Friday. A team spokesman could not be immediately reached for comment on Friday.