SCOTTSDALE, Ariz. >> Outfielder Mitch Haniger, one of the San Francisco Giants’ marquee free-agent additions, underwent an MRI on Friday night that revealed a Grade 1 strain in his left oblique, putting his status for Opening Day in question.

Haniger, 32, will be shut down for the next 5-7 days, the Giants said, and will be re-evaluated after that. Yet, with the start of the season less than three weeks away, Haniger and manager Gabe Kapler expressed optimism that the injury wouldn’t impact his availability.

“My goal is to be back as fast as possible,” Haniger said Saturday morning. “I feel confident that I’ll be back before Opening Day. But at the same time, I’ve got to listen to my body and listen to the trainers and do it right so it doesn’t come back.”

The oblique has been a lingering issue this spring for Haniger, who hadn’t appeared in a game since March 4. The strain didn’t occur on a single swing, Haniger said, but the muscle had been consistently tight for much of spring.

On Friday, he was penciled in to bat second and play right field but was scratched a couple hours before first pitch against the Rockies.

“It wasn’t bugging me at all in the games,” Haniger said. “I’d hit in the cage. I’d feel tight. I’d go work with the trainers. I’d feel immediate relief. Then I’d go play in the games and felt great in the games. … Best to just get it taken care of now so I can get healthy and help this team win games.”

A Grade 1 strain represents the least severe variety, while more serious Grade 2 and 3 strains can sideline players for six weeks or more.

Haniger previously missed two months in 2017 with a strained right oblique. But this one, he said, feels “way less severe.” In the past, it hurt to roll out of bed or get into a car, he said. In his day-to-day currently, “I feel really good,” he said.

“Obviously if I try to swing today, I’ll probably feel it,” Haniger said. “But I’m pretty optimistic for having a strain. … I was kind of shocked there was even a strain.”

In four games this spring, Haniger is 3-for-10 (.300) with two doubles. He signed a three-year, $43.5 million free-agent contract this offseason, the largest of the six deals awarded by president of baseball operations Farhan Zaidi, with the expectation that he will provide an everyday presence in one of the outfield corners and in the middle of the Giants’ batting order.

Haniger was limited to 57 games in 2022 because of a high-ankle sprain, and in seven big-league seasons, he has played more than 100 games only twice while dealing with a variety of ailments, most of which Zaidi attributed as “fluky” after signing him.

Nonetheless, the Giants are now down two right-handed-hitting outfielders from their projected Opening Day roster.

Austin Slater (elbow) has yet to appear in a Cactus League game but resumed throwing this week.

“My inclination is that Slates is trending in a direction where he’s going to be ready for us for the season,” Kapler said. “I don’t think anything that’s happened thus far changes our early season game planning.”

Notable

• Prior to Saturday’s game against the Dodgers, third baseman David Villar was scratched from the Giants lineup. He was dealing with tightness in his left hip, the club said, and was replaced in the lineup by Ford Proctor.