BUFFALO, N.Y. — Forward Carl Hagelin has faced Alex Ovechkin and the Capitals so often in the playoffs, the speedy, defensive specialist didn’t require an introduction upon practicing with his new teammates.

“It feels like I already know the guys on a personal level,” Hagelin said Friday after practicing for the first time with Washington after being acquired in a trade with Los Angeles a day earlier.

“I know what Washington is all about,” he added, referring to the six times he’s faced the Capitals in the playoffs during his seven NHL seasons. “And I think, obviously, they should know what they’re getting.”

That went without saying, Capitals coach Todd Reirden said.

Reirden’s lost track how many times he’s prepped his power-play units in warning them how disruptive Hagelin can be killing penalties.

“You’ve got to be aware of this guy, so it’s nice to not have to worry about that any longer and finally have him on our team,” Reirden said.

Hagelin has played 64 career games against the Capitals, with 35 of them in the playoffs. That included 2016 and ‘17, when the Penguins eliminated the Capitals on their way to winning back to back championships.

Hagelin received a stick-tap welcome from his teammates at center before practice, and then took a spot on the fourth line alongside Nic Dowd and Chandler Stephenson. Hagelin will make his Capitals’ debut Saturday, when Washington closes a six-game road trip at Buffalo.

The defending Stanley Cup champions placed a premium in shoring up their leaky penalty killing unit in the days leading up to the NHL trade deadline on Monday.

Aside from landing Hagelin, Washington acquired defenseman Nick Jensen on Friday in a trade with the Detroit Red Wings. The Capitals sent a 2020 second-round pick and defenseman Madison Bowey to Detroit for Jensen and a 2019 fifth-round pick.

The Capitals are so high on Jensen, who was in the final year of his contract, they signed him to a four-year, $10 million extension.