Al Harrington and Marquis Daniels were held out of the Indiana Pacers' game against the Bulls on Monday night because of a stomach ailment that also affected two other players.
The Pacers were also without guard Stephen Jackson, who was suspended because of his heated exchange with coach Rick Carlisle, who kicked him off the bench in a weekend loss to Cleveland.
Jermaine O'Neal was also sickened but wasn't going to play anyway because of a hamstring injury. He stayed back at the team hotel.
Jamaal Tinsley, also sick, will start for the Pacers.
Carlisle wasn't sure if it was food poisoning that caused the illness.
"Everybody is throwing up," said Carlisle. "I'm not really sure of all the details, but I just know a couple of guys couldn't get out of bed this morning."