There is no timetable for his return.
The 23-year-old had been dealing with a left Achilles injury recently, which forced him to miss three games. He received an injection on Saturday and had an ultrasound test but was cleared to play. Brooks returned from that injury on Sunday night, scoring six points on 3-for-10 shooting in 22 minutes in the Nets' 94-73 loss to the Toronto Raptors.
In 17 games, Brooks is averaging 14.8 points and 4.4 rebounds in 29.4 minutes.
Stevenson suffered the injury when he collided with Raptors small forward DeMar DeRozan 14 seconds into the third quarter. Stevenson went down in pain and limped off with trainer Tim Walsh. Stevenson went into the locker room but came back out and played some in the fourth quarter.
Okur, who has missed the last two games with recurring back issues, is visiting with a back specialist on Monday in New York City.
Mike Mazzeo is a regular contributor to ESPNNewYork.com.