DEERFIELD, Ill. -- Chicago Bulls forward Luol Deng tweeted that he was "the weakest I've ever felt" because of a viral flu that forced him to miss the Game 6 loss to the Brooklyn Nets, and said symptoms worsened Friday morning, leading to a trip to the emergency room and casting doubt on his status for Saturday's Game 7.

"It really upsets me that everyone thinks I would miss a game bc of the flu. I've played a lot of games w the flu in my career," Deng tweeted Friday afternoon.

Deng tweeted that he was taken to the emergency room Wednesday, and his symptoms indicated he might have meningitis, requiring him to undergo a spinal tap.

"As a result of the spinal tap I suffered the worst headache I've ever experienced and been the weakest I've ever felt," Deng tweeted. "Yesterday I was unable to walk or even get out of bed. I made it to the UC and was sent home. (Friday) morning my symptoms worsened."

Deng later tweeted: "Now I'm back in the ER where I may have to spend the night... I want my teammates and Bulls fans to know I would NEVER miss a game bc of flu.

"If I'm medically cleared I will fly to NY to be with my team and try to win game 7."

However, two sources told the Chicago Tribune that Deng is unliklely to get medically cleared.

The banged-up Bulls said guard Kirk Hinrich is improving but will be a game-time decision for Game 7 because of a bruised left calf.

"We'll see. [He will] get more treatment, and then we'll see," coach Tom Thibodeau said.

Guard Nate Robinson and forward Taj Gibson also suffered from the flu but were able to play in Game 6. Robinson, who played 42 minutes and scored 18 points, vomited on the bench during a break in play. Thibodeau said Friday that Robinson and Gibson are feeling better.

The short-handed Bulls, who also have been without Derrick Rose all season, had a rotation of six players for their 95-92 loss in Game 6. Jimmy Butler played all 48 minutes; Marco Belinelli, typically a reserve, played 46. Joakim Noah, who has been dealing with plantar fasciitis in his left foot, played 43 minutes.

When asked if he has any indication Rose would play Saturday, Thibodeau said, "No."

Despite the adversity facing them, Noah remains confident in their chances Saturday in Brooklyn.

"We're a team of fighters," Noah said Thursday. "We keep getting punched in the face but we fight back. I'm proud of this team, and we're going to go into a hostile environment in Brooklyn and we're going to win."

Thibodeau said the Bulls are looking forward to Game 7.

"It comes down to one game. It's the ultimate. That's what you play for," he said.

ESPNChicago.com's Nick Friedell contributed to this report.