BALTIMORE — Aaron Judge is set to take the next step in his comeback from a fractured rib that’s already kept him out for nearly three months.

Aaron Boone said Tuesday that Judge will be “introduced to his hitting progression this week.” Judge, according to the manager, has been doing “swing-related stuff” in the pool in recent days.

“He’s progressing,’’ Boone said. “It’s all part of the process. Hopefully it goes well. The fact that he’s responded in this first week of added intensity, as far as being allowed to do some things upper-body-wise — playing catch, running — it’s all part of his buildup.”

Judge had been limited to lower-body and light resistance training before playing catch last week for the first time since hitting the IL.

Boone wasn’t sure exactly when Judge would start swinging, but it’s a sign that he at least hasn’t suffered any setbacks.

There remains no timeline for Judge’s return.

Cody Bellinger’s return from a strained left hamstring to a lineup that has collapsed without him and Judge — as well as Giancarlo Stanton — is more imminent.

Aaron Judge will be “introduced to his hitting progression this week.” Jason Szenes for New York Post

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The outfielder was at Camden Yards Tuesday and said he will play a minor league rehab game with Triple-A Scranton/Wilkes-Barre on Thursday.

He anticipated needing more than just the one game before a return to the Yankees lineup, but didn’t rule out getting back to the majors.

He’s well aware of the lineup’s struggles without their big bats.

“I’ve wanted to get back for a while,’’ Bellinger said. “But you always want to be realistic. You want to come back and stay.”

As for Stanton, out since April with multiple calf strains, Boone said he was “towards the end of his running program. The intensity has picked up. He’s responded well.”

But it’s Judge’s absence that has hurt the most, as the Yankees entered Tuesday with the third-worst OPS and third-fewest runs scored since he’s been out.

George Lombard Jr. continues to impress with his glove and bat.

He had a pair of singles in a 3-1 win Tuesday and made a strong throw from deep in the hole to get Christian Encarnacion-Strand in the fourth.

The Yankees lost two challenges by the top of the fourth, as Heliot Ramos challenged a call in the first on a clear strike and Spencer Jones missed on a pitch to end the top of the fourth.

“Those weren’t good ones,’’ Boone said.

But the manager noted Austin Wells’ challenge from behind the plate on a Jackson Holliday strikeout in the second “might have [been] the best challenge of the season.”

It ended a bases-loaded threat.

Clarke Schmidt pitched off a mound Tuesday as he progresses in his comeback from Tommy John surgery, while Luis Gil ended his rehab assignment and is now at Triple-A Scranton/Wilkes-Barre.

Both right-handers are potential options to join the bullpen down the stretch.

Jazz Chisholm Jr. was back in the lineup after sitting against a right-hander Sunday in Toronto.

Boone said he considered putting José Caballero in the lineup again after Caballero sparked the offense in a victory against the Blue Jays.