Brett Brown and the Philadelphia 76ers are still unsure when NBA All-Star Joel Embiid will return to the court.

Embiid has missed Philadelphia's last four contests, including Thursday's showdown at the Oklahoma City Thunder, due to left knee soreness

The 24-year-old's status for Saturday's matchup against the Golden State Warriors is "completely up in the air," according to head coach Brown.

"There's nothing further going on to what we already said," Brown said. It's just the maintenance of some tendinitis. … We are still learning more."

Embiid is averaging 27.3 points and 13.5 rebounds this season.

He is shooting 48.2 per cent from the field and 29.5 per cent from three-point range.

The 76ers entered their game against the Thunder fourth in the Eastern Conference with a 39-22 record. They have won three of their last four games.