Anthony Rizzo was kept out of Sunday’s lineup by Aaron Boone, with the possibility the struggling first baseman may also sit Monday in Kansas City in an attempt to get him out of his prolonged slump.

“I just felt like it was time,’’ Boone said of the decision to sit Rizzo against the Dodgers. “It’s been on my mind a little bit. I felt [Sunday] was the day and we’ll see where we go from here.”

Boone added “maybe” Rizzo would get Monday off against the Royals, as well.

Rizzo, Boone and hitting coach James Rowson have talked extensively about the work Rizzo is doing off the field which leads them to believe he’ll be able to turn his season around soon.

The main issue has been Rizzo’s timing and the production has not been there.

“There are a few triggers he’s working on,’’ Boone said.

In seven games this month, Rizzo is just 1-for-29 with a double, one walk and three strikeouts.

And Boone noted that Rizzo’s issues go back “two to three weeks.”

Since May 14, Rizzo has gone 14-for-90 (.156), with an on-base percentage of .190 and since he has just a pair of extra-base hits in that stretch — both doubles — his slugging percentage in those 23 games is an almost impossibly low .178.

That all comes while the Yankees are on the hook for $17 million for this year and a $6 million buyout if they don’t pick up his $17 million team option for Rizzo next season.

With Rizzo on the bench, DJ LeMahieu slid over to first from third base and Oswaldo Cabrera started at third.

But the Yankees can’t continue to solely rely on Aaron Judge and Juan Soto and Rizzo’s powerful left-handed bat was expected to be a big part of the lineup.

“It’s a grind,’’ Boone said. “Especially being a hitter in this league, it’s hard — even when you’ve had a ton of success.”

That success is getting further in the rearview mirror for Rizzo, who has battled back and concussion issues the last two seasons.

Rizzo said he feels fine now and is just “in it.”

“There’s no question, the last two or three weeks have been a little struggle,” Boone said. “Sometimes, when you go through it and make adjustments and they don’t take right away, it’s hard. … Sometimes it’s a process and you’ve got to have small little gains along the way to get where you want to go and that’s hard as a player.”

And Boone also pointed to the fact that Rizzo has had some decent stretches this year, but those have been few and far between.

Rizzo had two extra-base hits in three games from May 10-12 and put together three multi-hit games in four days in mid-May, but all six hits were singles.

More disturbingly, Rizzo doesn’t have a home run since May 10.

“He’s still two to three weeks of getting going and all of a sudden his numbers line up,” Boone said. “He’s working through it. I’m confident he’ll get through it.”

And Boone believes Rizzo’s mindset is OK.

“I think he’s handling it quite well,’’ Boone said of the slump. “Winning helps. … I think he’s feeling it a little bit, but he has a good perspective.”