The All-Star center expressed frustration late Monday night about being held out of the Sixers' Game 2 loss to the Miami Heat thanks to injury.

Embiid has been sidelined since March 28 because of a broken orbital bone and concussion. He has cleared the NBA's concussion protocol but has not yet been cleared to take contact. There remains no definitive timetable for Embiid's return, though Brown said Tuesday that it is not "that far away."

"It's still moving forward," Brown said before the Sixers' practice on Tuesday afternoon. "What I can say is there is a very unified effort with his representation and the people around him. With the people that did the operation, the doctors, with our medical staff, with the team, with me, the coaching staff. We're all doing this. There's a unified sort of spirit and line of communication."

There are still a few medical hurdles for Embiid to clear as he returns from surgery, sources told ESPN's Ramona Shelburne. The recovery is a process of ramping up to different stages of activity.

Internally among the Sixers, there is optimism that Embiid will return when the series is in Miami, although it's unclear whether he will play in Game 3 on Thursday, according to sources.

Embiid was expected to practice with the team on Tuesday, participating in shooting drills and other non-contact activity. His presence on the practice floor was encouraging to Brown, who added that Embiid was progressing toward being cleared for contact.

"We'll get up and down and do some script stuff," Brown said. "It's progressing. When that ultimately leads to an answer -- he's playing -- I don't believe is that far away. But we'll learn more over the next 48 hours, I suspect."

Brown reiterated that he had no issue with Embiid expressing frustration on social media in the wake of Monday's loss.

"He just wants to play basketball," the coach had said Monday night. "He wants to be with his team. He wants to play in front of the fans, and he wants to see this through. And when he's not able to do that, he gets frustrated, and we respect his frustration. It's borne out of competitiveness."

Before its Game 2 loss, Philadelphia had been 9-0 in Embiid's absence. Brown said again on Tuesday that the club badly needs Embiid back, pointing to the team's struggles in the second quarter of Game 2 as an example. Miami outscored Philadelphia by 21 points in the second quarter.

"We had no semblance of order, offensively especially, that his presence, availability, makes the world go around," Brown said of Embiid, who averaged 22.9 points, 11.0 rebounds and 1.8 blocks in 63 games in the regular season.