Philadelphia 76ers All-Star point-forward Ben Simmons will be going under the knife.

The 24-year-old former Rookie of the Year winner injured his knee in a Thursday game against the Washington Wizards, which required the Australia native to leave the matchup. An MRI taken afterward came back clean, and an initial prognosis was day-to-day for Simmons.

However, according to ESPN's Adrian Wojnarowski, Ben Simmons will undergo surgery to remove a loose body in his left knee, causing him to leaving the bubble in Orlando, Florida.

Wojnarowski also reports that Simmons' timetable is “forthcoming,” with the Sixers not yet ruling out the two-time All-Star from the rest of the season.

However, Simmons will unlikely be healthy and available for the Sixers unless the Eastern Conference club makes a deep run in the playoffs, as the Sixers, currently possessing the sixth seed in the East, still have four more regular-season “seeding” games to go before the postseason begins. The first round of the playoffs is slated to begin next week and, depending on how many games it would take to win a first-round series, should the Sixers still be alive, there is no clear timeline for a Simmons return even in early September.

Simmons suffered what was diagnosed as subluxation of the knee against the Wizards—out-of-place movement of his kneecap. Besides the surgery to clean a loose body (likely a part of the bone), Simmons would also have to subject himself to an isolation period to quarantine should he return to the NBA's bubble in Orlando.