The Miami Heat took the rare step of announcing a player absence well in advance of tipoff Monday when coach Erik Spoelstra said guard Tyler Herro was out for Game 4 of the Eastern Conference finals due to a groin strain.

At the morning shootaround at TD Garden, Spoelstra said it was a matter of protecting Herro against instinct to push through.

“We just had to really be responsible and take the decision out of his hands,” Spoelstra said, with team physician Harlan Selesnick consulting with Herro before Spoelstra addressed the media. “He really wants to be out there.

“The trainers and Dr. Selesnick don’t think that’s the best idea, because of the intensity and everything. But we’ll see. He’s young. We’ll treat him day to day and we’ll see what happens from there.”

By contrast, the Boston Celtics waited until 90 minutes before tip-off to announce that starting point guard Marcus Smart was out, due to an ankle sprain. Smart also missed the Celtics’ Game 1 loss, due to a mid-foot sprain.

As for Herro, winner of the 2022 NBA Sixth Man of the Year award, the absence followed a rough patch, coming off a 4-of-15 shooting performance in Saturday night’s Game 3 victory over the Celtics that gave the Heat a 2-1 lead in the best-of-seven series.

It was a struggle that well may have been exacerbated by the groin issue.

“End of the first half,” Spoelstra said of the possible timing of Herro’s injury. “Think it was on a floater. He doesn’t totally remember. And then there was a closeout on Jaylen Brown on the very next possession. It could have happened during that sequence.”

Spoelstra said it is important the staff and trainers take a proactive approach in such situations.

“We have a lot of experience with it,” Spoelstra said. “I feel like I’ve been having these tough conversations with guys really the whole second half of the season, and then certainly in the playoffs.

“Guys want to make themselves available. This is the time of the year everybody wants to play. You play through more things than you would than if it was a November game. But there also is a responsibility to the athlete and their health, and we have to be disciplined to that. And sometimes these are tough decisions.”

Center Bam Adebayo said he felt for Herro.

“I feel like he has to be in some serious pain,” Adebayo said. “He’s our Sixth Man of the Year. In some games, he’s carried us. So that’s the biggest part on missing out on Tyler. He can score in bunches. He sees two shots go in and next thing you know he can have 10, 12 [points] in a quarter.”

Adebayo said this is when the veteran presence of Victor Oladipo stands so significant.

“Just because he’s worked so hard for this opportunity, going through injury, in and out of the lineup, and then we throw him in, he’s successful in his role. So we just need him to keep being successful in his role.”

Also on the side during the morning shootaround was starting power forward P.J. Tucker, who has been dealing with irritation of his left knee.

Despite Tucker wearing an inflatable sleeve over the knee and taking stimulation treatment, Spoelstra downplayed concern.

“I mean, he’s basically the same place he was in the shootaround before Game 3,”

The other prime injury concern going into Monday was the right-knee inflammation that kept starting small forward Jimmy Butler out for the second half of Saturday’s victory.

Spoelstra said Butler did not display any signs of restriction.

In addition, point guard Kyle Lowry was cleared to move forward, returning Saturday after missing eight of the previous 10 games due to a hamstring strain.

“He came through fine,” Spoelstra said.

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