Jordan Reed has missed three straight games with a concussion. (Jonathan Newton/The Washington Post)

Washington Redskins rookie tight end Jordan Reed missed another day of practice and continues to undergo testing for ongoing headaches, which are believed to be in relation to a headache he suffered four weeks ago, Coach Mike Shanahan said.

Reed, a third-round pick out of Florida, had emerged into a go-to receiving threat for the Redskins, recording 45 catches for 499 yards (both franchise rookie records for a tight end) and three touchdowns.

He has missed the last three games with the ongoing concussion symptoms. Reed attempted to play in each of the last two games, but wound up experiencing headaches leading up to the game and was ruled out.

Reed hadn’t practiced at all this past week.  Shanahan said on Thursday afternoon that the rookie was being tested “day-by-day,” and that the decision to end his season had “not been talked about – just evaluating him.”

Asked about the level of concern, Shanahan said, “Well, that’s why he’s seeing the doctors every day and seeing different doctors to see why he does have some headaches and why he hasn’t passed the tests. So it’ll be an ongoing process. I think that’s why they have this process to make sure somebody doesn’t come back too early, no matter what type of headache they do have. But if they don’t pass the test, there’s reason for concern.”

Fox Sports had reported Thursday evening that the Redskins had decided to end Reed’s season. But Reed’s agent, and a person within the Redskins organization both said that they were not aware of such a decision.

Practicing fully for the Redskins on Thursday despite injuries were left guard Kory Lichtensteiger (stinger), safety Brandon Meriweather (bruised sternum), safety Trenton Robinson (ankle) and fullback Darrel Young (hamstring).