The Bucks had not indicated before the game that Butler's knee was a problem. They went on to lose their 11th straight game, 92-76.
Butler is averaging 13.2 points per game off the bench for the Bucks.
Charlotte coach Steve Clifford said Kidd-Gilchrist spent Thursday with his foot in a boot and that last year's No. 2 overall draft pick wasn't able to participate in Friday morning's shootaround. Clifford said Kidd-Gilchrist would be evaluated on a day-to-day basis.
Kidd-Gilchrist is averaging 9.5 points and 5.4 rebounds. Taylor is averaging 8.8 points and 2.4 rebounds as a reserve.
The Associated Press contributed to this report.