A source told The Associated Press that Embiid and the Sixers have agreed on a four-year, $US196 million ($A269 million) contract extension that will take the All-Star centre through to the 2026-27 season.

The person spoke on condition of anonymity because the deal was not expected to be formally announced until later Tuesday.

The 27-year-old Embiid was NBA MVP runner-up this season and led the Sixers to the best regular-season record in the Eastern Conference. The Sixers lost in the second round to the Atlanta Hawks.

Embiid averaged of 28.5 points and 10.6 rebounds last season and became eligible for the NBA's super-max extension.

Embiid, the No. 3 overall pick of the 2014 draft, suffered a tear in his right meniscus during the playoffs. He played through the injury and has emerged as Philadelphia's franchise player.

His new deal will start in 2023-24. Embiid and the 76ers had signed a $148 million, five-year extension that kicked in with the 2018-19 season.

Embiid averaged 24.8 points and 11.3 rebounds over his first five seasons in the NBA.

The Cameroon native sat out his first two seasons with injuries and has never played more than 64 games in a season over his career. He missed games this year with a bone bruise on his left knee.

He scored a post-season career-high 36 points in 28 minutes in a Game 3 first-round win over Washington.

Embiid has solidified his future in Philly at the same time fellow All-Star guard Ben Simmons faces an uncertain one with the team after a rough offseason.

The Sixers expected to pair Embiid and Australian Simmons as cornerstones who could keep the Sixers East contenders for a decade.

Instead, Simmons became the scapegoat for the Sixers' early elimination from the playoffs and his name has been dangled in trade rumours all summer.

Australian Associated Press