Rivers says Reggie Bullock will start in his place Monday night. Bullock is averaging 2.9 points and 1.1 rebounds per game in limited action this season. Barnes is averaging 7.8 points and 2.1 rebounds.
Rivers says it is possible Barnes also could miss Wednesday's night game at Detroit.
For the Hornets, coach Steve Clifford says third-year forward Mike Kidd-Gilchrist is not close to returning from a stress reaction in his foot and that rookie guard P.J. Hairston likely will miss at least two more games while recovering from a sprained ankle.