Brandon Nimmo has undergone concussion testing amid prolonged Mets slump

As Brandon Nimmo and the Mets search for answers to explain his lengthy batting slump, Carlos Mendoza turned to a troubling similarity involving Anthony Rizzo with the Yankees from last season to help the skidding outfielder rule out a potential head injury.

Nimmo acknowledged Friday that he’s undergone further concussion testing in recent days after noting that his slump “has basically happened during the same time frame” since he was hit by a pitch in the head on May 24 against the Giants.

Nimmo stressed that he has experienced no concussion symptoms since that date — after passing initial tests that night — but he has continued undergoing head-injury evaluations after Mendoza told him what Rizzo went through last season with the Yankees.

The first baseman continued playing after suffering what the Yankees initially termed a neck injury in May, but after a lengthy batting slump, he eventually was shut down in August with post-concussion syndrome.

“I’ve undergone tests and we are going to do more, just because Mendy dealt with that last year and he understands,” Nimmo told The Post before going 2-for-3 with two singles and a hit by pitch in Friday’s 2-1 win against the Padres at Citi Field. “So there will be more tests. But I don’t have any symptoms. I don’t feel fuzzy, I’m not having any trouble sleeping, I don’t have any sensitivity to light.

“To my knowledge, I’m fine, but it is something that’s on the team’s radar, for sure. They’re trying to do right by me and making sure I continue to check all the boxes. So I will continue to undergo whatever they want me to do and make sure that nothing pops up. I just don’t think it’s an excuse, but it’s definitely weird that it correlates to getting hit in the head.”

Since he was drilled with a pitch by San Francisco’s Kyle Harrison three weeks ago, Nimmo has hit .210 with a .559 OPS and 27 strikeouts in 62 at-bats entering Friday’s series opener, including 10 strikeouts in his previous four starts.

If the struggles continue, Nimmo said he would consider reaching out to Rizzo, who batted just .172 with one homer in 169 at-bats after suffering his initial injury last season.

“I haven’t done that, but maybe that’s a good idea at some point. We’ll continue to do more tests, and maybe I’ll need to talk to Rizzo and ask him what he [went through],” Nimmo said. “To my knowledge, that’s not what this is, and I don’t want to use it as an excuse. But it is weird that it correlates with that time period.

“If one of these tests tells me we need to worry about it, we can address it then. Right now, I’m just trying to figure out what works. It’s a weird time, I’ve never swung and missed like this for such an extended time.”

Nimmo said he’s also wondered if his slump could be “a little subliminal, where you’re the slightest bit gun-shy and you don’t even know it.”

He also was slowed by an illness earlier in May and believes a few minor injuries have “kind of snowballed” on his swing more than any concussion concerns.

“We want to make sure we check all the boxes. So I keep checking with him, the trainers keep checking with him. We want to continue to make sure he passes every protocol and checks boxes. We will continue to stay on it,” Mendoza told The Post. “After Rizzo got hurt, he kept saying he was fine, too.

“And then however many weeks or months later, he came in and said, ‘I’m off’ and they said he had [a concussion]. So I want to make sure we stay on top of it with Nimmo. But he keeps saying he’s fine.”

In the meantime, the $162 million outfielder will attempt to figure out how to jumpstart his offensive game.

“We’re trying to throw stuff at the wall and see what sticks,” Nimmo said. “It’s definitely something that’s unacceptable and I’m frustrated by it.It’s not up to my standards, but it’s part of baseball and the only thing I can control is to just keep grinding every day and do what I can.”

“It’s like the old Yogi Berra saying that you can’t think and hit at the same time. It’s true. But that;s where we’re at. I understand it’s really bad, and I’m doing everything in my power to be better, but sometimes unfortunately it doesn’t happen overnight.”