The Seattle Seahawks were fined $US100,000 ($A140,000) the NFL for failure to follow concussion protocol during a game last month against the Arizona Cardinals, the league and the NFLPA announced Thursday.
The fine represents the maximum punishment for a first offence under the protocol.
In addition to the fine, the Seahawks' coaching and medical staffs will be required to attend remedial training regarding concussion protocol, the NFL and NFLPA said in its joint statement.
The announcement stems from quarterback Russell Wilson briefly leaving midway through the third quarter of Seattle's 22-16 win on November 9 after taking a hit to the chin from Arizona linebacker Karlos Dansby.
Referee Walt Anderson then sent Wilson off the field for a test.
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Wilson went into the medical tent on the sideline -- TV cameras showed the quarterback was only in the tent for seconds -- and sat out just one play before returning to the game.
