"He's been nicked up, but he said he was feeling a little bit better [Sunday]," Bulls coach Tom Thibodeau said. "He's day-to-day basically. The good thing is we have [had] a couple days without having to play, so I think the rest will help."
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Gibson was scheduled to be checked out by the Bulls medical staff later on Monday.
"I'm just hoping it's nothing [more] serious than what it is," Gibson said.
After shooting a combined 1 for 16 in the first two games of the Bulls' seven-game circus trip, Gibson had 17 points and 18 rebounds in a victory over the Dallas Mavericks on Friday.
The second-year forward is averaging 12.1 points and 7.3 rebounds a game.
Nick Friedell covers the Bulls for ESPNChicago.com and ESPN 1000.
Nick Friedell is the Chicago Bulls beat reporter for ESPN Chicago. Friedell is a graduate of the S.I. Newhouse School of Public Communications at Syracuse University and joined ESPNChicago.com for its launch in April 2009.