Philadelphia 76ers star Joel Embiid was ruled out of Monday night's 122-114 loss to the Washington Wizards with right knee soreness.

Embiid crashed to the floor after he was met in the air at the rim by Wizards center Robin Lopez just over seven minutes into Game 4. Lopez cleanly blocked the shot, but Embiid lost his balance on the way down and crashed onto his backside, instantly grimacing in pain.

He stayed in the game after a timeout and finished out the quarter but was in some discomfort, holding his lower right back area. After checking out of the game in the final seconds of the quarter, he went to the locker room, limping slightly.

"I wasn't even sure what it was," coach Doc Rivers said after the game. "I think it was the knee or the back and I'm not even sure you probably know more than I do."

Embiid made an impact in his time on floor, scoring 8 points with 6 rebounds, 2 assists and a steal in the first quarter. He came into the game averaging 30 points on 67% shooting in the series, which the Sixers lead 3-0.