Washington Redskins Coach Mike Shanahan had expressed pleasure with rookie quarterback Robert Griffin III’s play in the preseason opener at Buffalo, but the coach said he would have a better idea of how Griffin and his teammates played after having time to review game film.

Shanahan said Saturday that the game film confirmed in Griffin’s play what he had observed live.

“I thought he was cool, calm and collected,” Shanahan said. “I thought he did what he had to do. You’re hoping your quarterback does play like that in his first game, but many times, it doesn’t happen that way, especially in game situations. I was pleased, and hopefully we can keep on growing.”

Griffin played 14 snaps on Thursday, and completed 4 of 6 passes for 70 yards and a touchdown. His two incompletions came when Pierre Garcon was called out of bounds on an out-route along the sideline, and when tight end Niles Paul dropped a dump-off pass.

Griffin had a quarterback rating of 145.8 in Washington’s 7-6 victory.