A skirmish broke out between Louisville and Western Kentucky players during Saturday's game at E.A. Diddle Arena.
Footage of the incident, which occurred late in the first half, appears to show Cardinals power forward Montrezl Harrell throwing a punch.
A teammate then held Harrell Back after he was pushed away from the scrap.
Harrell was reportedly ejected on a Flagrant 2, which does not automatically result in a suspension.
Louisville hosts Cal State Northridge on Tuesday.
Harrell, a 6-foot-8 junior, is a projected first-round pick in the 2015 draft who is averaging a team-high 17.0 points and 10.4 rebounds this season.
Louisville entered Saturday with a 9-0 record and ranked fourth in the latest Associated Press Poll.
The Cardinals host No. 1 Kentucky on Dec. 27.