Updated

Chicago Bulls forward Luol Deng says the illness that kept him out of a playoff game against the Brooklyn Nets was far more serious than the flu.

He missed the Bulls' loss in Game 6 on Thursday with what coach Tom Thibodeau said were flu-like symptoms.

In one of a series of tweets from the hospital on Friday, Deng wrote: "It really upsets me that everyone thinks I would miss a game" because of the flu.

He also confirmed he had a spinal tap to rule out meningitis earlier in the week. And he indicated he will join the team for Game 7 in Brooklyn if he's medically cleared, although he might have to spend the night in the hospital.