Eight young males were escorted from the ground by police during the first half of Penrith's 18-12 victory.
NRL acting CEO Andrew Abdo said the governing body took the matter extremely seriously.
"Racism and vilification will not be tolerated in our game," he said.
"Bringing communities and cultures together is part of rugby league. We pride ourselves on being inclusive and taking a leadership role in driving social change.
"Any fan found to have racially abused a player or another fan will not be welcome at our games.