The NFL will re-examine its concussion protocols after concerns over the return to play of Miami quarterback Tua Tagovailoa after a head knock, before his removal on a stretcher from his next game four days later.
In a joint statement, the NFL and the NFL Players Association (NFLPA) said an investigation into the "application of the concussion protocol" involving Tagavailoa remained ongoing, and that no conclusions had been reached about protocol violations or medical errors.
"The NFL and the NFLPA agree that modifications to the concussion protocol are needed to enhance player safety," the organisations said in the statement.
