Robert Griffin III after suffering a concussion Sunday (Toni L. Sandys/The Washington Post)

The NFL will look into the Washington Redskins’ handling of the information they released during Sunday’s loss to the Atlanta Falcons about the concussion suffered by rookie quarterback Robert Griffin III, a league official said.

Teams are required to provide “accurate and timely injury information” during games, said the official, who spoke on condition that he not be identified by name.

After Griffin exited the game Sunday with a concussion, the Redskins announced that Griffin had been “shaken up” and his return to the game was questionable. No further update about Griffin’s injury status was provided during the game.

After the game, Redskins Coach Mike Shanahan said it became apparent to the team quickly that Griffin had a concussion.

“At that time when he wasn’t really sure what the score was, what quarter it was, we knew he had a mild concussion, at least according to the doctors,” Shanahan said. “He feels good right now—a lot better right now. But that was the situation, why he didn’t go back into the game.”

Under NFL rules, any player with concussion symptoms is prohibited from returning to a game.

Fellow rookie quarterback Kirk Cousins, who entered the game in relief of Griffin and played the rest of the way, said he was told by the team’s trainers that he would be going into the game and would be needed to finish it.

“I didn’t want to bother him,” Cousins said of Griffin. “Obviously he was going through a lot. I talked to the trainers and said, ‘Keep me posted.’ And they said, ‘You’re gonna go. And you’re gonna have to finish it.’ So I went from there. But I haven’t talked to Robert.”

Redskins spokesman Tony Wyllie said that Griffin had not been “officially determined” to have a concussion through medical testing when the team made its initial announcement during the game.

Griffin was examined by a neurologist at the stadium, according to the team. He did not go to a hospital and instead was sent home from the stadium, the Redskins said.

Under NFL rules, he cannot practice or play in a game until being cleared to do so by an independent neurologist.