Following a collision with Sharks forward Luis Scola near the end of the first quarter, Zhou left the court in a wheelchair after he was aided by trainers and other staff members.
The 22-year-old Zhou played only four minutes Tuesday night in his first preseason appearance, registering two rebounds and one blocked the shot. He is in his second season with the Rockets, having averaged 1.2 points and 1.2 rebounds in 18 games in 2017-18.
Zhou was a second-round draft pick out of the Chinese Basketball Association in 2016, and he made his NBA debut on Oct. 21, 2017, with the Rockets.
(With inputs from agencies.)