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.