PHILADELPHIA — It’s all but certain that a “lower-body” injury suffered in the first period of Game 3 against Philadelphia will keep defenseman Adam McQuaid out of the Bruins’ Game 4 of the Eastern Conference semifinal series Friday night.

“[He’s] very doubtful for tomorrow, but then will be a day-to-day situation,” said head coach Claude Julien, who gave most of his team a day off the ice.

It’s not a done deal yet that Mark Stuart will step into McQuaid’s spot in the lineup, but the veteran blueliner is very close. All it would take is a doctor’s approval Friday to get Stuart into a game for the first time since April 1.

“He’s good enough [conditioning-wise] that we could throw him in there if we needed to. Again, it’s a situation where we’ll make that decision tomorrow, Julien said. “Obviously we’ve got some Ds that are logging a lot of minutes right now that are capable of doing it. So it’s up to us to make that decision whether he’s ready to handle the minutes that we want to give him.”

Stuart was among a handful of players that skated, including Trent Whitfield and Brad Marchand, who are the top candidates to replace the injured David Krejci. Stuart even skated without the contraption that inserts the antibiotics into his vein to fight his finger infection. He’d have to pop it out and pop it back in if he plays in a game.

“They’ve explained all that to me and done a good job keeping me up to speed on what’s going on. I’ve gotten a few different opinions and everyone’s on the same page,” he said.