D.C. United captain Steve Birnbaum has been ruled out of Saturday’s match at New England because of a concussion while two others seem doubtful.
Birnbaum suffered the injury in a head-to-head collision in the late stages of a 2-0 away defeat Saturday against the New York Red Bulls. The fourth-year center back reported to RFK Stadium on Tuesday but remained inside while the team trained.
He must pass concussion protocol before the medical staff will allow him to resume workouts. Hence, there is no firm timetable for his return.
“He’s still a touch groggy,” Coach Ben Olsen said.