PHILADELPHIA — Capitals defenseman Matt Niskanen suffered an undisclosed “lower-body” injury against the Philadelphia Flyers on Wednesday night at Wells Fargo Center. Washington announced Niskanen would not play in the third period, and he will be re-evaluated Thursday.

After the game, Coach Barry Trotz said Niskanen’s injury does not seem “too serious.”

“We’ll look at home tomorrow, but when he first was diagnosed by our trainers, it was more precautionary,” Trotz said. “We’ll get our doctors to look at it, and we’ll see where we are tomorrow.”

Niskanen seemed to hurt his left leg in a collision with Flyers defenseman Radko Gudas in the second period.

Niskanen had been averaging 22:39 for the Capitals entering Wednesday while playing on the top power play and penalty kill unit. He has four goals and 28 assists this season, already matching his points total for all of last season. After he initially went back to the locker room in the second period, he came back, took one penalty-kill shift and then returned to the locker room again.

Depending on the severity of Niskanen’s injury, the Capitals could consider recalling right-shot defenseman Tom Gilbert, who the team traded for last week during its bye.