San Francisco 49ers star defensive end Nick Bosa has been fined by the NFL for wearing a hat with a pro-Donald Trump message during a postgame television interview, a person familiar with the matter told the Associated Press on Saturday.

Bosa was fined $11,255 for violating the NFL uniform and equipment rules for wearing a hat that contained a personal message, according to the person who spoke to the AP on condition of anonymity because the fine wasn’t announced by the NFL.

Bosa crashed a television interview that included quarterback Brock Purdy during NBC’s postgame coverage of the Niners’ win over the Dallas Cowboys on 27 October. Bosa pointed to a message on his white hat that read ‘Make America Great Again’ in support of Trump’s candidacy for president.

NFL rules state that “throughout the period on game-day that a player is visible to the stadium and television audience (including in pregame warm-ups, in the bench area, and during postgame interviews in the locker room or on the field), players are prohibited from wearing, displaying, or otherwise conveying personal messages either in writing or illustration, unless such message has been approved in advance by the League office.”

Bosa, who agreed to a five-year, $170m contract extension in September 2023, said earlier this week that he was aware that his actions could be subject to a fine.

“It was well worth it,” he said.