Philadelphia 76ers star Joel Embiid underwent surgery on an orbital fracture, the NBA team announced on Saturday.

There is no timetable for Embiid's recovery, with the All-Star set to have a "post-operative examination in approximately 5-7 days".

Embiid took a shot to the head from team-mate Markelle Fultz's shoulder in the second quarter of Wednesday's 118-101 victory over the New York Knicks and was forced to go to the locker room.

The 24-year-old was wobbly heading off the court, but the Sixers announced that the big man suffered a simple facial contusion.

Embiid did not return and underwent a concussion test, which he passed.

The Cameroon international made his first All-Star team this season and leads the 76ers in points (23.2) and rebounds (11.1) per game.