BOSTON — Luis Severino gave the Yankees more than 30 starts and 190 innings in each of the previous two seasons. And in both years, Dellin Betances appeared in 66 games.

In 2019, neither right-hander has thrown a pitch for them, both sidelined by shoulder injuries during spring training and then sidetracked by lat strains during their attempted comebacks.

If they’re going to get back to The Bronx in time to make an impact on the postseason, Friday figures to be a key night, as Severino and Betances are scheduled to pitch for Double-A Trenton in the Thunder’s playoff game.

It would be Severino’s second rehab start after he threw an inning and gave up a pair of runs for Triple-A Scranton/Wilkes-Barre on Sunday. He threw 33 pitches — and 12 more in the bullpen — and figures to get at least as much work on Friday.

Betances faced hitters at Yankee Stadium on Tuesday in a simulated inning, but Friday will be his first time in a game.

The Yankees have played their way to the best record in the majors without them, but Severino would bolster a rotation that has battled inconsistency this season, but been better of late. Should Betances return, a heavily taxed bullpen would add a dangerous — and fresh — arm.

Among the challenges in their returns figures to be going from what amounts to spring training straight into the stretch run and playoffs.

Aaron Boone said he’s not worried about that and believes they will get enough work before the end of the regular season to be sharp in time for the postseason.

Their career numbers would seem to back that up, as Severino typically pitches well in the first month of the season, although he doesn’t strike out as many as he does the rest of the season — and Betances is also usually strong early and then fades in September.

If either or both are healthy, the Yankees’ will have a different look to their staff come October.