Coach Jay Gruden said Reed reported symptoms Tuesday and was in the process of being checked out. Reed did not practice Wednesday and Gruden said his tight end is going through the NFL's concussion protocol. The coach added that Washington is taking the ''cautious approach.''
Reed, who has a history of concussions, is Washington's top offensive target. The 26-year-old has 33 catches for 316 yards and two touchdowns this season.
''He's done some great things early in the season already so far for us,'' wide receiver DeSean Jackson said. ''Hopefully it's not too serious. Hopefully it's just protocol and hopefully we'll have him for Sunday because we definitely need him and he definitely is a big part of what we do. Hopefully he'll be all right and ready to go.''
Gruden said he didn't want to speculate on what the impact of another concussion would mean for Reed until test results come back.
''He just had some symptoms, it doesn't mean it is'' a concussion, Gruden said. ''We just want to make sure we take the right steps.''
Reed set career highs with 87 catches, 952 yards and 11 touchdowns in 2015 and is in the first season of a $46.75 million, five-year deal. His value to the Redskins can't be overstated.
''He's a very talented player,'' quarterback Kirk Cousins said. ''He's shown that. We love to have our best players out on the field with us. But like I said, you understand that it's a part of playing in this league that injuries are going to happen.''
Reed isn't the only Washington player dealing with an injury.
Linebacker Su'a Cravens was a limited participant in practice Wednesday after he missed the Redskins' game at Baltimore with a concussion. Gruden said Cravens got eyeglasses to help in his rehabilitation and left practice early to see a doctor.
The second-round pick out of USC was at the center of some unwanted attention after posting on his public Snapchat account that he'd have to wear glasses the rest of his life because he had permanent damage and would be unable to track objects without them. Gruden said Cravens now understands what injury information not to post on social media.
''I don't think he meant anything by it,'' Gruden said. ''But it wasn't the right thing to do at that time.''
Cornerbacks Bashaud Breeland (ankle) and Dashaun Phillips (hamstring) continue to make progress after missing the past two games. Gruden said they partially participated in practice but wasn't ready to say they're on track to play against Philadelphia.
Breeland, Washington's No. 2 cornerback after Josh Norman, said he feels very confident he'll be on the field against the Eagles.
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