Taj Gibson will miss his second game in as many nights Friday when Chicago takes on the Memphis Grizzlies, Bulls coach Tom Thibodeau said.
Gibson missed Thursday's victory over the New York Knicks because of a right ankle problem.
Gibson, who is averaging 12.6 points, 7.2 rebounds, 1.5 assists and 1.4 blocks, also missed six games because of a left ankle sprain earlier this season.
The Bulls will also be without Derrick Rose for the second straight night, as the start point guard is battling an illness.