The Philadelphia 76ers will need Joel Embiid back for the Eastern Conference semi-finals, despite their Game 4 victory over the Brooklyn Nets.

That is according to Tyrese Maxey, who labelled team-mate Embiid as a "leader", though the Sixers secured a 4-0 series sweep of the Nets without him on Saturday.

Embiid led the league for points per game in the regular season (33.1), but suffered a knee sprain in Game 3 against Brooklyn.

While a series comeback still seemed unlikely, the Nets had some hope on Saturday when they led by eight at half-time at Barclays Center, only for the Sixers to fight back and take the game 96-88.

Philadelphia will face either the Boston Celtics or Atlanta Hawks in the Eastern Conference semis, which the Celtics lead 2-1 ahead of Game 4 on Sunday, and Maxey hopes Embiid can be back in time.

"It starts with Joel," the Sixers guard said. "He's the leader of this team and for him, he takes the guys before the game and he told us good luck and we appreciate him for that. And we need him to get healthy."

Tobias Harris top-scored with 25 on Saturday, while James Harden had an impressive outing with 17 points, 11 assists and eight rebounds, and he echoed Maxey's comments.

"Obviously, today was big for us, so we can get [the] big fella healthy," Harden said. "That's priority number one."

Coach Doc Rivers had explained the situation with Embiid before the game, but clarified further afterwards, suggesting the Cameroonian perhaps has a "50 per cent" chance of making it for the next round.

"I just don't know," he said. "I would say, right now, it's probably the same percentage I said before the game... probably 50 per cent, at best."