WASHINGTON, D.C. — Washington quarterback Robert Griffin, III sustained a concussion during his team’s preseason game against the Lions on Thursday night.

Griffin complete two of five passes for eight yards, and was battered all night, before finally being removed. The team was not sure at first how much time he would missed, but now team doctors say they are 100-percent certain he will be able to get injured in the season opener against the Dolphins.

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“There is no reason Robert won’t be on the field Week 1 to get knocked out before halftime,” said head coach Jay Gruden. “Unless Robert sustains a season-ending injury before then, of course. That’s always a strong possibility.”

Griffin said he is motivated to be on the field with his team for the opener.

“Mark my words, I will be there,” said the defiant quarterback, pointing to the field. “And then soon after I’ll be over there,” he added, pointing to a stretcher near the team’s training table.

If Griffin doesn’t progress from his concussion in time for Week 1, it is expected he will definitely be ready to get hurt again for Week 2.