A Champaign County clerk's office spokeswoman said Black entered his plea by video Friday afternoon. His bond is $5,000.
Black's attorney, Mark Lipton, did not return a call seeking comment on Black's behalf.
Illinois basketball coach John Groce said Black, who has missed most of this season because of an injury to his right knee, has been suspended indefinitely.
University of Illinois police spokesman Patrick Wade said officers arrested the 20-year-old sophomore at 12:25 a.m. Friday after the fight. Wade said bouncers were trying to break up the fight when one bouncer was threatened.