Niskanen (undisclosed) is travelling with the team and is questionable for Saturday's tilt against the Senators, Isabelle Khurshudyan of The Washington Post reports.
EDGE Analysis
Niskanen endured a heavy collision along the boards in Thursday's 3-1 win against the Hurricanes and did not return. The Capitals can only hope the 32-year-old isn't out long, but Madison Bowey is expected to take his spot on the second pairing alongside Dmitry Orlov should he miss any time.