TORONTO — A bad Saturday night at the Air Canada Centre got worse for the Washington Capitals when defenseman Matt Niskanen suffered a lower-body injury late in the second period. He played a shift in the third period before going back to the locker room for the rest of the game.

Coach Barry Trotz didn’t have an update on Niskanen after the game other than saying he would be reevaluated Sunday. Washington is off Sunday and doesn’t play again until Thursday against the New York Islanders.

Since Niskanen signed with the Capitals two seasons ago, he has played in every game. He and defenseman Karl Alzner are the team’s shutdown defense pair, tasked with the most challenging defensive assignments. Niskanen has averaged the second-most time on ice (22:46) on the team this season, playing on the top penalty-kill unit and recently promoted to the first power play.

Through 21 games, Niskanen has nine assists this season.

Niskanen wasn’t the only one who suffered an injury Saturday night as Trotz was struck with a puck that flew into the bench five seconds into the game. The only visible damage was a welt on his forehead. Asked about getting hit with the puck after the game, Trotz cracked, “What puck?”