Pittsburgh Steelers quarterback Ben Roethlisberger was diagnosed with a concussion after leaving the field late in the fourth quarter of his team's 39-30 loss to the Seattle Seahawks on Sunday.

Roethlisberger has been placed in the NFL's concussion protocol, but a source told ESPN his symptoms subsided quickly and he feels better.

Roethlisberger self-reported concussion symptoms to the team, which evaluated him shortly thereafter, according to the Steelers. Roethlisberger was in the locker room after the game but did not address the media.