The Celtics now know when they will take the court for Game 1 of the Eastern Conference finals: next Tuesday at 8 p.m. at the TD Garden.

It remains unclear, however, whether they’ll do so with their full starting five.

Boston head coach Joe Mazzulla had no update Friday on the status of injured big man Kristaps Porzingis, who missed the entire Eastern Conference semifinals with a soleus strain in his right calf.

“I have no idea,” Mazzulla said in a video conference with reporters. “I don’t have an update on him.”

Porzingis, who averaged 20.1 points and 7.2 rebounds per game during the regular season, has not played since Game 4 of the Celtics’ first-round series against Miami. He sat out all five games in Round 2 against Cleveland, with veteran Al Horford starting in his place and Luke Kornet providing frontcourt depth off the bench.

The 37-year-old Horford played 31.6 minutes per night against the Cavaliers — nearly five minutes above his regular-season average — and was sensational in Wednesday’s Game 5 clincher, becoming the first player ever to record 22 points, 15 rebounds, five assists, three blocks and six 3-pointers in an NBA playoff game.

No player on the Celtics’ roster can replicate the 7-foot-2 Porzingis’ abilities at both ends of the floor, however, and getting him back and healthy could prove crucial as they progress deeper into the postseason.

The Celtics caught a schedule-related break Thursday night when the Minnesota Timberwolves routed the Denver Nuggets 115-70 to force a Game 7 in their Western Conference semifinal. Had that series and the East semifinal between the New York Knicks and Indiana Pacers both finished in six games, Boston would have begun the conference finals on Sunday rather than Tuesday.

The delayed start means two additional recovery days for Porzingis, who resumed basketball activities last week and went through an on-court workout during Monday’s shootaround in Cleveland.

“It’s always great to have him around,” guard Derrick White told reporters on Monday, “and we know he’s doing everything he can to get back with us.”

The top-seeded Celtics are 26-5 without Porzingis this season, including a 5-1 record during his current playoff absence. This is their third straight Eastern Conference finals appearance and their sixth in the last eight years.

Last year, the Celtics were upset by the Heat in the East finals, dropping the first three games before ultimately losing in seven. Mazzulla, who was a first-year head coach at the time, believes this current group will be better prepared, with or without its game-changing big.

“What’s the difference between this year and last year? … The difference is we’ve had time,” Mazzulla said. “We’ve had experiences to pull from, and we’ve had time to talk about those. … We’ve had time to talk about how we’ve handled past situations. I think that’s it right there.”

The Celtics’ next opponent could be determined Friday night, when the Knicks will look to close out the Pacers in Game 6 at Gainbridge Fieldhouse. If Indiana survives, Game 7 would be Sunday afternoon at Madison Square Garden.

Celtics guard Jrue Holiday gets some high-fives from fans after Boston eliminated the Cleveland Cavaliers 113-98 during Game 5. (Matt Stone/Boston Herald)