If settling three position battles on the offensive line wasn’t already challenging enough for the Giants, right tackle Evan Neal’s absence is about to add more uncertainty.

After he left the field with trainers, Neal didn’t finish practice Friday and was diagnosed with a concussion, according to the team.

He was replaced by Matt Peart during 11-on-11 periods — a sour final note to a practice during which Neal earlier had won at least two of his three one-on-one pass-rushing reps.

Neal’s development in his second season is one of the keys for the Giants, but he must now clear the five-step concussion protocol before returning to the field.

The Giants practice Saturday, are off Sunday and then practice again Monday in East Rutherford before they fly to Detroit for two joint practices with the Lions.

“Evan has done a good job,” head coach Brian Daboll said before practice. “He’s improved, he’s got the right mindset and we’ll just keep grinding along with him.”

Those best-laid plans got interrupted.

The Giants started training camp with Ben Bredeson and John Michael Schmitz competing at center, and Bredeson and Josh Ezeudu competing at left guard.

As Schmitz settles in at center, Tyre Phillips has joined the mix at left guard and Bredeson also is rotating at right guard, where returning starter Mark Glowinski is no longer entrenched.

“It’s whoever plays the best,” Daboll said. “An interior offensive lineman’s job is to keep the pocket firm and get movement at the line of scrimmage. So, they’ll get a lot of opportunities to do that, and whoever are the best two or three or however many it is, that’s who we’ll go with.”

Left tackle Andrew Thomas is the one certainty remaining.

“We’re trying to make it as competitive as we can,” Daboll said. “Some of that is just, ‘Lets see this player against this player.’ You can’t move everybody around so maybe you move one person one day and you don’t want to see him all the time against one particular player … so we can get a good evaluation.”

Many a recent Giants season has been marred by poor offensive-line play, so how will this group build any cohesion with all the rotating starters?

“Not only is cohesion [between] whoever is starting the first game,” Schmitz said. “It’s collective as a whole O-line unit, making sure everyone knows what we’re going to do out there.”

Shea Tierney was coaching quarterbacks as usual Friday after his wife, Emily, gave birth to the couple’s first child (a daughter) late Thursday.

“He hasn’t had much sleep,” Daboll said, “but he’s here at practice. Congratulations to them.”

The Giants waived/injured WR Jeff Smith and signed NT Donovan Jeter, who played in one game for the Commanders as an undrafted rookie last season.

The Giants’ defensive line depth is light with A’Shawn Robinson and D.J. Davison on the physically unable to perform list and Ryder Anderson sidelined.

The rookie Schmitz was asked about the Front Office Sports report that his alma mater, Minnesota, is a football program “fraught with intimidation and toxicity” under head coach P.J. Fleck.

The report cited a handful of anonymous former players and staff members who would have overlapped with Schmitz’s six-year stay.

“I’m not going to talk on behalf of Coach Fleck,” Schmitz said. “I’ve just got nothing but good things to say about him anyway.”

Schmitz also delivered the quote of the day.

Asked whether the blood on his jersey was his or someone else’s, he quipped, “Could be both.”