ASHBURN, Va. — Washington Redskins tight end Jordan Reed said he knew he had suffered a concussion during a recent game and didn’t tell anyone.

Reed missed the Redskins’ most recent game against the Philadelphia Eagles. He was limited in practice Wednesday and was wearing a yellow noncontact jersey.

Coach Jay Gruden said Reed hasn’t been ruled out of Sunday’s game at the Detroit Lions.

“We have to wait and see what the independent doctor says and see how he does going through some work outside on a limited basis,” Gruden said.

The 26-year-old Reed said he’s not getting too excited about the possibility of getting back into game action. He suffered a concussion on a hit to the back of the head in the third quarter of a game at Baltimore on Oct. 9 and didn’t leave the field.

The NFL announced new protocol that will require an athletic trainer in the press box to stay in contact with on-field doctors to determine if a player has a concussion.

Reed reported symptoms — nausea, irritability and “a pretty bad headache” — to the team on Tuesday and was asked to undergo testing.

“I took the concussion test and did pretty bad on it,” Reed said.

This is the sixth documented concussion for Reed in his professional and college career. Reed, who signed a $46.75 million, five-year extension in the offseason, doesn’t know why he’s susceptible to concussions but isn’t taking this one lightly now.

“A concussion is a concussion,” he said. “You’ve got to take it serious every time and make sure you fix it.”

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