Steve Young does not believe that Robert Griffin III's style of play is sustainable.

The Washington Redskins quarterback broke the record for most rushing yards by a rookie QB in his last game, with four games still remaining.

The former Tampa Bay Buccaneers and San Francisco 49ers quarterback told the Los Angeles Times: "If you're playing for 10 or 15 years, you can't every week run six option plays.

"It can be a part of the game, but sooner or later you've got to deliver the ball from the pocket. That's the game.

"Now, if the game changes, and it's proven a championship can be won from the pistol spread, then I'm wrong. But until I'm proven wrong, it's definitely a great way to win some games, especially from the red zone."

The Redskins face the Baltimore Ravens on Sunday.