There is no doubt Philadelphia 76ers star Joel Embiid is performing at an MVP level following his monstrous double-double midweek, according to Tobias Harris.

The 76ers took down Eastern Conference rivals the Boston Celtics 117-109 thanks to Embiid's 42 points and 10 rebounds in Philadelphia on Wednesday.

Embiid – returning to action following knee soreness – had 22 points in the first half as the three-time All-Star topped 40 points for the second time in three games, joining Washington Wizards guard Bradley Beal as the only NBA players with multiple such performances.

There is only one other instance where a Sixers player had a 40 and 10 game on one or fewer turnovers since the three-point era – Embiid himself in 2019.

76ers team-mate Harris hailed Embiid, who is averaging 26.4 points, 11.3 rebounds and 2.8 assists per game this season.

"It's not sort of, it's for sure MVP-calibre," Harris told reporters of Embiid after the 76ers improved to 10-5, and 8-1 on home court.

76ers head coach Doc Rivers was also full of praise following Embiid's mammoth display, which consisted of 12-of-19 shooting in 34 minutes.

"I'm not surprised at the level," Rivers said. "He's just more talented than even I knew. I knew he was extremely talented, but he has so many more gifts."

Harris, who signed a maximum contract at the start of 2019-20, contributed 22 points to help the 76ers past the Celtics.

His performance was not lost on Embiid, who added: "Tobias had a great night. He's playing at an All-Star level as he should be and he should be an All-Star."

"I just pride myself on doing whatever I can for our team," Harris said. "Making winning plays and the right play out there so that's just been my MO and I know my role as a player and I know what's asked of me night after night to be a leader and also to be a top player on this team and I’m embracing that."

While Ben Simmons did not have the best offensive outing, the two-time All-Star excelled defensively.

Simmons almost recorded a triple-double with 11 points, eight rebounds and eight assists, while he tallied two steals as he defended the likes of Kemba Walker, Jaylen Brown and Marcus Smart.

"I thought Ben was unbelievable defensively," Rivers said. "First of all, we put him on Kemba tonight, we put him on Jaylen Brown tonight, put him on Marcus Smart tonight. It's amazing what he can do for us and tonight was a great example of that."