Chicago Bulls forward Luol Deng underwent a spinal tap to test for viral meningitis, a person with the knowledge of the situation told USA TODAY Sports on Thursday.

The person requested anonymity because he was not authorized to speak publicly about Deng's health.

The test came back negative, and Deng arrived at United Center Thursday in hopes of playing. He was not feeling well enough to play and was sent home about 90 minutes before tip-off, Bulls coach Tom Thibodeau said.

"He was in the facility in the morning and got treatment," Thibodeau said. "Came in this evening and got more treatment. I didn't find out until about an hour, hour and a half before the game."

Deng, who had the test Wednesday, wasn't the only ailing Bulls player. Forward Taj Gibson and guard Nate Robinson were also hampered by flu-like symptoms in the Brooklyn Nets' 95-92 victory in Game 6 on Thursday.

"It's unusual, but it's all around right now," Thibodeau said of the illnesses. "Everyone's feeling a little under the weather. You just deal with it."

Thibodeau said Robinson, who had 18 points and four assists, has been sick for "a while."

"That's part of it. In the NBA over the course of a season, guys get sick, they play through illness," Thibodeau said. "Nate still functioned. He battles."