If both Beecher and Lauko can get their feet moving, force turnovers, and pin the Sabres in their own zone on Tuesday, that could be the makings of a smash-mouth fourth line that can do damage whenever they hop over the boards — especially alongside Milan Lucic.

Mason Lohrei makes his debut 

Most of the hype surrounding the Bruins’ blue-chip prospects early on in camp has usually centered around forwards like Matthew Poitras, Fabian Lysell, and Georgii Merkulov (who will play tonight).

But Tuesday will also see defenseman Mason Lohrei make his preseason debut, with the 22-year-old blueliner expected to log top-pairing minutes alongside Brandon Carlo.

“It’s been a lot of fun playing with him,” Carlo said on Tuesday. “I feel like our communication is getting better. And then from there, he’s had some really great moments moving the puck.

“You can tell that he’s got that within his game. But with our length and long sticks, hopefully we will be able to close a lot of those rushes off by the blue line. And that’s something I’m looking to do tonight. But [he’s] definitely impressed me so far.”

Lohrei (61 points in 71 games at Ohio State) boasts arguably the highest ceiling among Bruins prospects given his playmaking capabilities. While there are many D-men whose game revolve around their O-zone play, few also clock in at 6-foot-4 and 209 pounds like Lohrei.

A strong camp could see the left-shot skater potentially push for a spot on the NHL roster, especially further down on the depth chart. Still, the cautious route for Lohrei might see him open the year in Providence to get a bit more seasoning.

He’s logged a total of eight AHL games in his career, with his skating and D-zone play standing as areas of emphasis for him to improve on.

“What I like about him is his brain, his length, his feet,” Montgomery said of Lohrei. “He has tremendous poise with the puck. Again, I think the benefit of him going to play in Providence and getting a lot of games is getting used to our system.

“He seems to be very comfortable now this year in playing fast defensively in our D-zone. … We need to see at the NHL level — how many battles is he going to win? How often is he going to win foot races to be first on the puck? And how much does he help us in our transition offensively and defensively?”

Can PTO candidates put their best foot forward?

There are several prospects and Providence regulars trying to land an NHL gig over the next two weeks.

But the two players feeling the most pressure this preseason might be forwards Alex Chiasson and Danton Heinen, who are both operating on professional tryout (PTO) contracts.

Based on Tuesday’s morning skate, Heinen will skate on a line with Georgii Merkulov and Oskar Steen, while Chaisson will skate with Lucic and Marc McLaughlin.

Both wingers could be in the mix for vacancies across the bottom-six unit, especially on a third line next to a potential duo of Morgan Geekie and Trent Frederic.

Heinen might hold the early edge thanks to his versatility and familiarity with both the Bruins and Jim Montgomery (his collegiate coach at the University of Denver.) But Chiasson could be a useful power-play weapon for Boston, especially at the netfront.

“I think both have been very effective in camp so far,” Montgomery said of Heinen and Chiasson. “You can tell that they’re NHL players and they have NHL brains and they work at the right pace. They need to outplay people. That’s what needs to happen.”