Derrick White will miss out on Game 2 of the Eastern Conference finals against the Miami Heat on Thursday night over the looming birth of his child. 

At the same time, Marcus Smart is expected to rejoin the Celtics after missing the series opener with a foot sprain, the team announced earlier. 

The Celtics updated their injury report on Thursday to reflect White’s absence, which listed him as out due to "personal reasons," but head coach Ime Udoka clarified it was because White’s wife was having a baby much sooner than expected. 

2022 NBA Playoffs Boston Celtics Derrick White

Derrick White of the Boston Celtics dribbles during Game 1 of the Eastern Conference Finals on May 17, 2022, at FTX Arena in Miami, Florida. (David Dow/NBAE via Getty Images)

"You don't want to say it's a tough situation. We knew he was expecting a baby soon," Udoka said. "Things happen in life and we always support our guys."

Smart could possibly rejoin the team for Game 2 after he did not play on Monday night because of a mid-foot sprain he sustained during Boston’s Game 7 victory over the Milwaukee Bucks

CELTICS’ JAYSON TATUM BLAMES GAME 1 LOSS VS. HEAT ON HIS THIRD QUARTER PERFORMANCE: ‘IT’S ON ME’

Udoka told reporters his return was "probable." 

2022 NBA Playoffs Boston Celtics Marcus Smart

Giannis Antetokounmpo of the Milwaukee Bucks drives to the basket against the Celtics during Game 7 of the Eastern Conference Semifinals at TD Garden on May 15, 2022, in Boston. (Adam Glanzman/Getty Images)

"When he goes before the game, we'll know from there, but he looked better in shootaround today and overall we expect him to play."

CLICK HERE FOR MORE SPORTS COVERAGE ON FOXNEWS.COM

Also making a return will be Al Horford who entered into the NBA’s health and safety protocols for the third time this season. The Celtics announced late Thursday afternoon that his status had been upgraded to "available." 

2022 NBA Playoffs Boston Celtics Al Horford

Al Horford of the Celtics dunks the ball against the Milwaukee Bucks at TD Garden on May 15, 2022, in Boston.  (Adam Glanzman/Getty Images)

CLICK HERE TO GET THE FOX NEWS APP

Miami will be looking to take a 2-0 lead when they host Boston in Game 2 of the Eastern Conference Finals tonight at 8:30 ET.

The Associated Press contributed to this report.