The incident occurred during the second quarter when Fultz attempted to go around Embiid and a Knicks player on a pick.
The center was injured while colliding with teammate Markelle Fultz.
However, he later began experiencing symptoms, has since been diagnosed with a concussion, and has been placed in the NBA's concussion protocol.
Embiid is averaging 22.9 points, 11 rebounds, and 1.8 blocks and has been a key factor in putting the Sixers back in the playoffs for the first time in six seasons. At least without Embiid, Philadelphia should have little trouble defeating Atlanta when looking at how horrendous their season has been for the most part, although that doesn't mean they won't be looking to play the spoiler role for a team battling for playoff seeding.
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Philadelphia is only within a half-game of Cleveland for the third spot and could end up not facing them if the team manages to stay within fourth or fifth place - as the Cavs seem fated to face the sixth-place Washington Wizards with seven games left in the schedule.
The Sixers announced Embiid suffered a facial contusion on Wednesday night, but have since downgraded their superstar.
Embiid lay on the court for several minutes, holding his face, before being helped off the court and escorted to the locker room, where, according to the 76ers, he "passed the NBA's locker room concussion assessment tool".
Embiid remained on the floor before finally being assisted by Philadelphia's trainer. On Sunday, the 76ers clinched their first playoff berth since 2012, and their surprisingly successful season has been fueled by Embiid's strong play. Joel Embiid is out for longer than we were led to believe. "When Embiid goes to the bench, the 76ers have been outscored by 3.9 points per 100 possessions, barely better than the New York Knicks' net rating (minus-4.4)". "He's a tough guy". Philadelphia now owns the No. 4 spot in the Eastern Conference playoff race, and has already clinched a spot.