WEST SACRAMENTO, Calif. — By the time he landed on the injured list last month, Giancarlo Stanton was not exactly lighting the world on fire.

In 24 games, the veteran DH had three home runs, a 102 OPS+ (100 being average) and 14 RBIs.

But the Yankees have sorely missed him beyond his production. His absence has been noticeable, with their left-handed heavy lineup losing an important righty bat in the middle of it, giving opponents a slightly easier task in how they attack the Yankees.

“That’s huge,” manager Aaron Boone said before the Yankees opened a series against the vagabond Athletics on Friday at Sutter Health Park. “And that’s more on the nights where we’re facing a righty, where I got six or seven lefties in there. Having him in that middle, his presence is massive. Hopefully not too much longer. Obviously we want him back in there. But his presence is real.”

Stanton was finally cleared to start an outdoor running progression this week after yet another MRI exam showed enough improvement in his right calf for him to advance to the next step of his rehab.

The 36-year-old has been hitting all along, which should help expedite his return, but he will still have to check off more boxes, all the way up through running the bases, before he is able to return.

If the past is any indication, Stanton may not end up needing to go out on a rehab assignment because he is not playing the field, so taking live batting practice — which Boone indicated he might be able to do at some point next week — and at-bats off the Trajekt pitching machine may be enough.

Still, it figures to be another week or two, at least, before Stanton is ready to be activated.

In the time between Stanton’s injury and both Anthony Volpe and José Caballero being on the active roster together, the Yankees only had two right-handed bats guaranteed to be in the lineup when they were facing a right-handed starter — Aaron Judge and Caballero or Volpe.

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That was not a problem when facing the starter, but once that pitcher was out of the game, teams with multiple lefties in their bullpens could better line up for tough matchups for the Yankees.

In general, when he has three right-handed hitters in his lineup, Boone likes to slot them batting second, fifth and eighth, or third, sixth and ninth — guaranteeing that if a lefty comes in, he has to face at least one of those right-handed bats.

But without Stanton, if the Yankees only had two righty bats in the lineup — say, Judge batting third and Caballero batting seventh — the lanes were easier for teams to match up well with left-on-left at-bats, even with the right-handed hitting Paul Goldschmidt and Amed Rosario looming on the Yankees bench.

That was mitigated some by the switch-hitting Jasson Domínguez being called up in Stanton’s absence, with the ability to flip around (especially as he was starting to hit lefties better), but that only lasted until Domínguez sprained the AC joint in his left shoulder May 7. He, like Stanton, could also begin facing live pitching next week as he has started to ramp up his baseball activities.

In the five games after the Yankees optioned the lefty-hitting Spencer Jones to Triple-A to make room for Caballero to come off the injured list, Goldschmidt had started all of them at first base, with Ben Rice moving to DH. Only two of those games came with a lefty on the mound, but the presence of Goldschmidt’s right-handed bat in the middle of the lineup has somewhat mimicked Stanton.

“Huge,” Boone said. “Just giving us that little bit of balance in the order, and obviously what he does with lefties, usually when I lead him off, he’s been so good in that role and in that spot. He’s playing really well and we need it right now.”