ASHBURN, Va. (October 8, 2012) -- Washington Redskins coach Mike Shanahan says "right now it looks good" that Robert Griffin III will be able to play Sunday against the Minnesota Vikings.

Shanahan said Griffin was experiencing no dizziness, headaches or vomiting Monday, a day after the No. 2 overall draft pick suffered a concussion in a loss to the Atlanta Falcons.

Shanahan emphasized that Griffin will have to go through a series of tests to satisfy the NFL's return-to-play protocol. If there are any setbacks during the testing, the coach almost certainly will start Kirk Cousins or Rex Grossman against the Vikings.

A teammate said Monday that rookie quarterback Robert Griffin III "seems to be doing well" a day after he suffered a concussion in the Washington Redskins' loss to the Atlanta Falcons.

Backup quarterback Kirk Cousins said he and Griffin attended a mandatory meeting for rookies Monday morning and said Griffin looked fine and was "in good spirits."

Griffin was knocked out of Sunday's 24-17 loss in the third quarter on a legal hit to the helmet by linebacker Sean Weatherspoon while scrambling near the sideline.

The No. 2 overall draft pick will have to go through the NFL's return-to-play protocol and before he is cleared to practice.

He is also not allowed to speak to reporters until he is symptom-free.

Cousins finished the game in Griffin's place, throwing a touchdown pass and two interceptions.