The NFL and NFL Players Association have warned the Miami Dolphins for "not strictly" following the league's concussion protocol with Matt Moore earlier this month.
The Dolphins were not fined or penalized but were told both are possible if they have any future violations of the protocol.
The incident took place in the team's playoff loss to the Pittsburgh Steelers.
"The Miami Dolphins were notified in a letter co-signed by Dr. Hunt Batjer, co-chair of the NFL head, neck & spine committee and Dr. Thom Mayer, medical director for the NFLPA, that the NFL-NFLPA review determined that the protocol was not strictly followed," the league said in a statement. "The letter further advised the Dolphins that they must engage their staff in a full review of the protocol and conduct additional education, if necessary. The Dolphins were also advised that any future deviation from the protocol may result in enhanced discipline, including monetary fines assessed against the club."