(CNN) — The National Football League and the NFL Players Association agreed to update the league’s concussion protocol over the weekend.

The decision follows a review of the response to Miami Dolphins quarterback Tua Tagovailoa’s injury on September 25 after he suffered an apparent head injury and was later allowed to reenter the game. He was later hospitalized for a concussion. Under the new protocols, players will be unable to compete if they are experiencing ataxia, which describes a lack of coordination caused by poor muscle control. The NFL’s chief medical officer said the NFL would take a “conservative” approach to ruling players out. On Sunday, the new concussion protocol went into effect and several players were sidelined under the new rules.